1188953600661 has 16 divisors (see below), whose sum is σ = 1761436797120. Its totient is φ = 792624908880.

The previous prime is 1188953600657. The next prime is 1188953600759. The reversal of 1188953600661 is 1660063598811.

It is not a de Polignac number, because 1188953600661 - 2² = 1188953600657 is a prime.

It is a super-2 number, since 2×1188953600661² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1188953600598 and 1188953600607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1188953600651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2045911 + ... + 2561963.

It is an arithmetic number, because the mean of its divisors is an integer number (110089799820).

Almost surely, 2^{1188953600661} is an apocalyptic number.

It is an amenable number.

1188953600661 is a deficient number, since it is larger than the sum of its proper divisors (572483196459).

1188953600661 is an equidigital number, since it uses as much as digits as its factorization.

1188953600661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601393 (or 601387 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 1188953600661 in words is "one trillion, one hundred eighty-eight billion, nine hundred fifty-three million, six hundred thousand, six hundred sixty-one".