1181513551657 has 4 divisors (see below), whose sum is σ = 1181535227136. Its totient is φ = 1181491876180.

The previous prime is 1181513551651. The next prime is 1181513551667. The reversal of 1181513551657 is 7561553151811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1181513551657 is a prime.

It is a super-3 number, since 3×1181513551657³ (a number of 37 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181513551657.

It is not an unprimeable number, because it can be changed into a prime (1181513551651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10755769 + ... + 10865062.

It is an arithmetic number, because the mean of its divisors is an integer number (295383806784).

Almost surely, 2^{1181513551657} is an apocalyptic number.

It is an amenable number.

1181513551657 is a deficient number, since it is larger than the sum of its proper divisors (21675479).

1181513551657 is an equidigital number, since it uses as much as digits as its factorization.

1181513551657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21675478.

The product of its digits is 630000, while the sum is 49.

The spelling of 1181513551657 in words is "one trillion, one hundred eighty-one billion, five hundred thirteen million, five hundred fifty-one thousand, six hundred fifty-seven".