25640455401 has 24 divisors (see below), whose sum is σ = 41388590880. Its totient is φ = 15160651200.

The previous prime is 25640455391. The next prime is 25640455439. The reversal of 25640455401 is 10455404652.

25640455401 is a `hidden beast` number, since 2 + 5 + 640 + 4 + 5 + 5 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 25640455401 - 2¹⁴ = 25640439017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25640455441) 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, 3154411 + ... + 3162528.

It is an arithmetic number, because the mean of its divisors is an integer number (1724524620).

Almost surely, 2^25640455401 is an apocalyptic number.

It is an amenable number.

25640455401 is a deficient number, since it is larger than the sum of its proper divisors (15748135479).

25640455401 is a wasteful number, since it uses less digits than its factorization.

25640455401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316997 (or 6316994 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 25640455401 in words is "twenty-five billion, six hundred forty million, four hundred fifty-five thousand, four hundred one".