15910481957 has 4 divisors (see below), whose sum is σ = 15911951340. Its totient is φ = 15909012576.

The previous prime is 15910481947. The next prime is 15910482037. The reversal of 15910481957 is 75918401951.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7894144801 + 8016337156 = 88849^2 + 89534^2 .

It is a cyclic number.

It is not a de Polignac number, because 15910481957 - 2⁴ = 15910481941 is a prime.

It is a super-2 number, since 2×15910481957² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15910481947) 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, 718328 + ... + 740145.

It is an arithmetic number, because the mean of its divisors is an integer number (3977987835).

Almost surely, 2^15910481957 is an apocalyptic number.

It is an amenable number.

15910481957 is a deficient number, since it is larger than the sum of its proper divisors (1469383).

15910481957 is a wasteful number, since it uses less digits than its factorization.

15910481957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469382.

The product of its (nonzero) digits is 453600, while the sum is 50.

The spelling of 15910481957 in words is "fifteen billion, nine hundred ten million, four hundred eighty-one thousand, nine hundred fifty-seven".