25631708490 has 48 divisors (see below), whose sum is σ = 66652796808. Its totient is φ = 6834060288.

The previous prime is 25631708477. The next prime is 25631708497. The reversal of 25631708490 is 9480713652.

25631708490 is a `hidden beast` number, since 2 + 5 + 631 + 7 + 0 + 8 + 4 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17137689921 + 8494018569 = 130911^2 + 92163^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (25631708497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 685314 + ... + 721746.

It is a 1-persistent number, because it is pandigital, but 2⋅25631708490 = 51263416980 is not.

Almost surely, 2^25631708490 is an apocalyptic number.

25631708490 is an abundant number, since it is smaller than the sum of its proper divisors (41021088318).

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

25631708490 is a wasteful number, since it uses less digits than its factorization.

25631708490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44263 (or 44260 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 25631708490 in words is "twenty-five billion, six hundred thirty-one million, seven hundred eight thousand, four hundred ninety".