25021065064 has 8 divisors (see below), whose sum is σ = 46914497010. Its totient is φ = 12510532528.

The previous prime is 25021065053. The next prime is 25021065067. The reversal of 25021065064 is 46056012052.

It can be written as a sum of positive squares in only one way, i.e., 24967160100 + 53904964 = 158010^2 + 7342^2 .

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

It is not an unprimeable number, because it can be changed into a prime (25021065067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1563816559 + ... + 1563816574.

Almost surely, 2^25021065064 is an apocalyptic number.

It is an amenable number.

25021065064 is a deficient number, since it is larger than the sum of its proper divisors (21893431946).

25021065064 is a wasteful number, since it uses less digits than its factorization.

25021065064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127633139 (or 3127633135 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 25021065064 in words is "twenty-five billion, twenty-one million, sixty-five thousand, sixty-four".