25151981761 has 4 divisors (see below), whose sum is σ = 25185834432. Its totient is φ = 25118129092.

The previous prime is 25151981741. The next prime is 25151981801. The reversal of 25151981761 is 16718915152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25151981761 - 2¹⁵ = 25151948993 is a prime.

It is a super-2 number, since 2×25151981761² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25151981711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16925221 + ... + 16926706.

It is an arithmetic number, because the mean of its divisors is an integer number (6296458608).

Almost surely, 2^25151981761 is an apocalyptic number.

It is an amenable number.

25151981761 is a deficient number, since it is larger than the sum of its proper divisors (33852671).

25151981761 is an equidigital number, since it uses as much as digits as its factorization.

25151981761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33852670.

The product of its digits is 151200, while the sum is 46.

The spelling of 25151981761 in words is "twenty-five billion, one hundred fifty-one million, nine hundred eighty-one thousand, seven hundred sixty-one".