25019758979 has 4 divisors (see below), whose sum is σ = 25020333000. Its totient is φ = 25019184960.

The previous prime is 25019758931. The next prime is 25019758987. The reversal of 25019758979 is 97985791052.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25019758979 - 2¹² = 25019754883 is a prime.

It is a super-2 number, since 2×25019758979² (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 (25019758909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215729 + ... + 310770.

It is an arithmetic number, because the mean of its divisors is an integer number (6255083250).

Almost surely, 2^25019758979 is an apocalyptic number.

25019758979 is a deficient number, since it is larger than the sum of its proper divisors (574021).

25019758979 is an equidigital number, since it uses as much as digits as its factorization.

25019758979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574020.

The product of its (nonzero) digits is 14288400, while the sum is 62.

The spelling of 25019758979 in words is "twenty-five billion, nineteen million, seven hundred fifty-eight thousand, nine hundred seventy-nine".