25502661064 has 8 divisors (see below), whose sum is σ = 47817489510. Its totient is φ = 12751330528.

The previous prime is 25502661047. The next prime is 25502661083. The reversal of 25502661064 is 46016620552.

It can be written as a sum of positive squares in only one way, i.e., 16991122500 + 8511538564 = 130350^2 + 92258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×25502661064² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1593916309 + ... + 1593916324.

Almost surely, 2^25502661064 is an apocalyptic number.

It is an amenable number.

25502661064 is a deficient number, since it is larger than the sum of its proper divisors (22314828446).

25502661064 is a wasteful number, since it uses less digits than its factorization.

25502661064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187832639 (or 3187832635 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 25502661064 in words is "twenty-five billion, five hundred two million, six hundred sixty-one thousand, sixty-four".