25451515645 has 16 divisors (see below), whose sum is σ = 32402442240. Its totient is φ = 19137674304.

The previous prime is 25451515633. The next prime is 25451515669. The reversal of 25451515645 is 54651515452.

It is not a de Polignac number, because 25451515645 - 2¹³ = 25451507453 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042702 + ... + 1066831.

It is an arithmetic number, because the mean of its divisors is an integer number (2025152640).

Almost surely, 2^25451515645 is an apocalyptic number.

It is an amenable number.

25451515645 is a deficient number, since it is larger than the sum of its proper divisors (6950926595).

25451515645 is a wasteful number, since it uses less digits than its factorization.

25451515645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109684.

The product of its digits is 600000, while the sum is 43.

The spelling of 25451515645 in words is "twenty-five billion, four hundred fifty-one million, five hundred fifteen thousand, six hundred forty-five".