25491013632 has 450 divisors, whose sum is σ = 88845767703. Its totient is φ = 7283146752.

The previous prime is 25491013627. The next prime is 25491013633. The reversal of 25491013632 is 23631019452.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

25491013632 is a `hidden beast` number, since 2 + 5 + 4 + 9 + 1 + 0 + 13 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12745506816 + 12745506816 = 112896^2 + 112896^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=112896.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25491013633) by changing a digit.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 3641573373 + ... + 3641573379.

Almost surely, 2^25491013632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25491013632

25491013632 is an abundant number, since it is smaller than the sum of its proper divisors (63354754071).

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

25491013632 is an frugal number, since it uses more digits than its factorization.

25491013632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 25491013632 in words is "twenty-five billion, four hundred ninety-one million, thirteen thousand, six hundred thirty-two".