25551276779 has 16 divisors (see below), whose sum is σ = 30742867200. Its totient is φ = 20745375264.

The previous prime is 25551276767. The next prime is 25551276781. The reversal of 25551276779 is 97767215552.

It is not a de Polignac number, because 25551276779 - 2²⁴ = 25534499563 is a prime.

It is a super-2 number, since 2×25551276779² (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 (25551276479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1570217 + ... + 1586405.

It is an arithmetic number, because the mean of its divisors is an integer number (1921429200).

Almost surely, 2^25551276779 is an apocalyptic number.

25551276779 is a deficient number, since it is larger than the sum of its proper divisors (5191590421).

25551276779 is a wasteful number, since it uses less digits than its factorization.

25551276779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28082.

The product of its digits is 9261000, while the sum is 56.

The spelling of 25551276779 in words is "twenty-five billion, five hundred fifty-one million, two hundred seventy-six thousand, seven hundred seventy-nine".