15880492310981 has 8 divisors (see below), whose sum is σ = 16026385603800. Its totient is φ = 15734602667520.

The previous prime is 15880492310971. The next prime is 15880492310987. The reversal of 15880492310981 is 18901329408851.

It can be written as a sum of positive squares in 4 ways, for example, as 11220791565025 + 4659700745956 = 3349745^2 + 2158634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15880492310981 - 2²² = 15880488116677 is a prime.

It is a super-2 number, since 2×15880492310981² (a number of 27 digits) contains 22 as substring.

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 15880492310981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15880492310987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8251661 + ... + 9992541.

It is an arithmetic number, because the mean of its divisors is an integer number (2003298200475).

Almost surely, 2^{15880492310981} is an apocalyptic number.

It is an amenable number.

15880492310981 is a deficient number, since it is larger than the sum of its proper divisors (145893292819).

15880492310981 is a wasteful number, since it uses less digits than its factorization.

15880492310981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824679.

The product of its (nonzero) digits is 4976640, while the sum is 59.

The spelling of 15880492310981 in words is "fifteen trillion, eight hundred eighty billion, four hundred ninety-two million, three hundred ten thousand, nine hundred eighty-one".