25621516415273 has 32 divisors (see below), whose sum is σ = 26653629721632. Its totient is φ = 24609186201600.

The previous prime is 25621516415153. The next prime is 25621516415329. The reversal of 25621516415273 is 37251461512652.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 8645905113664 + 16975611301609 = 2940392^2 + 4120147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25621516415273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25621516411273) 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 31 ways as a sum of consecutive naturals, for example, 1728723203 + ... + 1728738023.

It is an arithmetic number, because the mean of its divisors is an integer number (832925928801).

Almost surely, 2^{25621516415273} is an apocalyptic number.

It is an amenable number.

25621516415273 is a deficient number, since it is larger than the sum of its proper divisors (1032113306359).

25621516415273 is a wasteful number, since it uses less digits than its factorization.

25621516415273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16605.

The product of its digits is 3024000, while the sum is 50.

The spelling of 25621516415273 in words is "twenty-five trillion, six hundred twenty-one billion, five hundred sixteen million, four hundred fifteen thousand, two hundred seventy-three".