26640662559 has 96 divisors (see below), whose sum is σ = 43353616320. Its totient is φ = 14495459328.

The previous prime is 26640662551. The next prime is 26640662563. The reversal of 26640662559 is 95526604662.

It is not a de Polignac number, because 26640662559 - 2³ = 26640662551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640662551) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 90923617 + ... + 90923909.

It is an arithmetic number, because the mean of its divisors is an integer number (451600170).

Almost surely, 2^26640662559 is an apocalyptic number.

26640662559 is a deficient number, since it is larger than the sum of its proper divisors (16712953761).

26640662559 is a wasteful number, since it uses less digits than its factorization.

26640662559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 26640662559 in words is "twenty-six billion, six hundred forty million, six hundred sixty-two thousand, five hundred fifty-nine".