25581473262164 has 6 divisors (see below), whose sum is σ = 44767578208794. Its totient is φ = 12790736631080.

The previous prime is 25581473262157. The next prime is 25581473262181. The reversal of 25581473262164 is 46126237418552.

It can be written as a sum of positive squares in only one way, i.e., 21862245301264 + 3719227960900 = 4675708^2 + 1928530^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197684157767 + ... + 3197684157774.

It is an arithmetic number, because the mean of its divisors is an integer number (7461263034799).

Almost surely, 2^{25581473262164} is an apocalyptic number.

It is an amenable number.

25581473262164 is a deficient number, since it is larger than the sum of its proper divisors (19186104946630).

25581473262164 is a wasteful number, since it uses less digits than its factorization.

25581473262164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6395368315545 (or 6395368315543 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 56.

The spelling of 25581473262164 in words is "twenty-five trillion, five hundred eighty-one billion, four hundred seventy-three million, two hundred sixty-two thousand, one hundred sixty-four".