26861863232505 has 64 divisors (see below), whose sum is σ = 51860244326400. Its totient is φ = 11598261903360.

The previous prime is 26861863232489. The next prime is 26861863232527. The reversal of 26861863232505 is 50523236816862.

It is not a de Polignac number, because 26861863232505 - 2⁴ = 26861863232489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19678920 + ... + 20999609.

It is an arithmetic number, because the mean of its divisors is an integer number (810316317600).

Almost surely, 2^{26861863232505} is an apocalyptic number.

It is an amenable number.

26861863232505 is a deficient number, since it is larger than the sum of its proper divisors (24998381093895).

26861863232505 is a wasteful number, since it uses less digits than its factorization.

26861863232505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40678894.

The product of its (nonzero) digits is 24883200, while the sum is 57.

The spelling of 26861863232505 in words is "twenty-six trillion, eight hundred sixty-one billion, eight hundred sixty-three million, two hundred thirty-two thousand, five hundred five".