25386562640 has 40 divisors (see below), whose sum is σ = 59904722400. Its totient is φ = 10003061376.

The previous prime is 25386562631. The next prime is 25386562667. The reversal of 25386562640 is 4626568352.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2362790 + ... + 2373509.

It is an arithmetic number, because the mean of its divisors is an integer number (1497618060).

Almost surely, 2^25386562640 is an apocalyptic number.

25386562640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25386562640 is an abundant number, since it is smaller than the sum of its proper divisors (34518159760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25386562640 is a wasteful number, since it uses less digits than its factorization.

25386562640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4736379 (or 4736373 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 25386562640 in words is "twenty-five billion, three hundred eighty-six million, five hundred sixty-two thousand, six hundred forty".