26341564978 has 8 divisors (see below), whose sum is σ = 39518829468. Its totient is φ = 13168621824.

The previous prime is 26341564973. The next prime is 26341564987. The reversal of 26341564978 is 87946514362.

It can be written as a sum of positive squares in 2 ways, for example, as 23447878129 + 2893686849 = 153127^2 + 53793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×26341564978² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26341564973) 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, 1065051 + ... + 1089502.

Almost surely, 2^26341564978 is an apocalyptic number.

26341564978 is a deficient number, since it is larger than the sum of its proper divisors (13177264490).

26341564978 is a wasteful number, since it uses less digits than its factorization.

26341564978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160668.

The product of its digits is 8709120, while the sum is 55.

The spelling of 26341564978 in words is "twenty-six billion, three hundred forty-one million, five hundred sixty-four thousand, nine hundred seventy-eight".