25678734979 has 4 divisors (see below), whose sum is σ = 25788944376. Its totient is φ = 25568525584.

The previous prime is 25678734943. The next prime is 25678735007. The reversal of 25678734979 is 97943787652.

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 25678734979 - 2⁹ = 25678734467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25678734919) 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, 55104349 + ... + 55104814.

It is an arithmetic number, because the mean of its divisors is an integer number (6447236094).

Almost surely, 2^25678734979 is an apocalyptic number.

25678734979 is a deficient number, since it is larger than the sum of its proper divisors (110209397).

25678734979 is a wasteful number, since it uses less digits than its factorization.

25678734979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110209396.

The product of its digits is 160030080, while the sum is 67.

The spelling of 25678734979 in words is "twenty-five billion, six hundred seventy-eight million, seven hundred thirty-four thousand, nine hundred seventy-nine".