25151220513 has 12 divisors (see below), whose sum is σ = 36339034368. Its totient is φ = 16763098680.

The previous prime is 25151220443. The next prime is 25151220559. The reversal of 25151220513 is 31502215152.

25151220513 is a `hidden beast` number, since 25 + 1 + 5 + 122 + 0 + 513 = 666.

It is not a de Polignac number, because 25151220513 - 2¹⁷ = 25151089441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25151220713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 328593 + ... + 397838.

It is an arithmetic number, because the mean of its divisors is an integer number (3028252864).

Almost surely, 2^25151220513 is an apocalyptic number.

It is an amenable number.

25151220513 is a deficient number, since it is larger than the sum of its proper divisors (11187813855).

25151220513 is a wasteful number, since it uses less digits than its factorization.

25151220513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730284 (or 730281 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 25151220513 its reverse (31502215152), we get a palindrome (56653435665).

The spelling of 25151220513 in words is "twenty-five billion, one hundred fifty-one million, two hundred twenty thousand, five hundred thirteen".