1351660661531 has 4 divisors (see below), whose sum is σ = 1351678247064. Its totient is φ = 1351643076000.

The previous prime is 1351660661501. The next prime is 1351660661537.

1351660661531 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1351660661531 is a prime.

It is a super-2 number, since 2×1351660661531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351660661537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8676965 + ... + 8831366.

It is an arithmetic number, because the mean of its divisors is an integer number (337919561766).

Almost surely, 2^{1351660661531} is an apocalyptic number.

1351660661531 is a deficient number, since it is larger than the sum of its proper divisors (17585533).

1351660661531 is an equidigital number, since it uses as much as digits as its factorization.

1351660661531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17585532.

The product of its (nonzero) digits is 291600, while the sum is 44.

The spelling of 1351660661531 in words is "one trillion, three hundred fifty-one billion, six hundred sixty million, six hundred sixty-one thousand, five hundred thirty-one".