51605233655 has 4 divisors (see below), whose sum is σ = 61926280392. Its totient is φ = 41284186920.

The previous prime is 51605233633. The next prime is 51605233733. The reversal of 51605233655 is 55633250615.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51605233655 - 2⁸ = 51605233399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5160523361 + ... + 5160523370.

It is an arithmetic number, because the mean of its divisors is an integer number (15481570098).

Almost surely, 2^51605233655 is an apocalyptic number.

51605233655 is a deficient number, since it is larger than the sum of its proper divisors (10321046737).

51605233655 is a wasteful number, since it uses less digits than its factorization.

51605233655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10321046736.

The product of its (nonzero) digits is 405000, while the sum is 41.

The spelling of 51605233655 in words is "fifty-one billion, six hundred five million, two hundred thirty-three thousand, six hundred fifty-five".