25447395640 has 32 divisors (see below), whose sum is σ = 57544380000. Its totient is φ = 10127804544.

The previous prime is 25447395637. The next prime is 25447395643. The reversal of 25447395640 is 4659374452.

It is an interprime number because it is at equal distance from previous prime (25447395637) and next prime (25447395643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25447395643) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1590495 + ... + 1606414.

It is an arithmetic number, because the mean of its divisors is an integer number (1798261875).

Almost surely, 2^25447395640 is an apocalyptic number.

25447395640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25447395640 is an abundant number, since it is smaller than the sum of its proper divisors (32096984360).

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

25447395640 is a wasteful number, since it uses less digits than its factorization.

25447395640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197119 (or 3197115 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 25447395640 in words is "twenty-five billion, four hundred forty-seven million, three hundred ninety-five thousand, six hundred forty".