15775721460145 has 32 divisors (see below), whose sum is σ = 19251761508000. Its totient is φ = 12408439701504.

The previous prime is 15775721460043. The next prime is 15775721460157. The reversal of 15775721460145 is 54106412757751.

It can be written as a sum of positive squares in 16 ways, for example, as 989820040609 + 14785901419536 = 994897^2 + 3845244^2 .

It is a cyclic number.

It is not a de Polignac number, because 15775721460145 - 2⁹ = 15775721459633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58408129 + ... + 58677601.

It is an arithmetic number, because the mean of its divisors is an integer number (601617547125).

Almost surely, 2^{15775721460145} is an apocalyptic number.

It is an amenable number.

15775721460145 is a deficient number, since it is larger than the sum of its proper divisors (3476040047855).

15775721460145 is a wasteful number, since it uses less digits than its factorization.

15775721460145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270309.

The product of its (nonzero) digits is 8232000, while the sum is 55.

The spelling of 15775721460145 in words is "fifteen trillion, seven hundred seventy-five billion, seven hundred twenty-one million, four hundred sixty thousand, one hundred forty-five".