26399665494 has 48 divisors (see below), whose sum is σ = 58078878000. Its totient is φ = 8665558848.

The previous prime is 26399665477. The next prime is 26399665531. The reversal of 26399665494 is 49456699362.

26399665494 is a `hidden beast` number, since 26 + 3 + 9 + 9 + 66 + 549 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278532 + ... + 361080.

It is an arithmetic number, because the mean of its divisors is an integer number (1209976625).

Almost surely, 2^26399665494 is an apocalyptic number.

26399665494 is an abundant number, since it is smaller than the sum of its proper divisors (31679212506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26399665494 is a wasteful number, since it uses less digits than its factorization.

26399665494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82829 (or 82826 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 63.

The spelling of 26399665494 in words is "twenty-six billion, three hundred ninety-nine million, six hundred sixty-five thousand, four hundred ninety-four".