51236645601 has 4 divisors (see below), whose sum is σ = 68315527472. Its totient is φ = 34157763732.

The previous prime is 51236645591. The next prime is 51236645641. The reversal of 51236645601 is 10654663215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51236645601 - 2⁵ = 51236645569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51236645601.

It is not an unprimeable number, because it can be changed into a prime (51236645641) 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, 8539440931 + ... + 8539440936.

It is an arithmetic number, because the mean of its divisors is an integer number (17078881868).

Almost surely, 2^51236645601 is an apocalyptic number.

It is an amenable number.

51236645601 is a deficient number, since it is larger than the sum of its proper divisors (17078881871).

51236645601 is a wasteful number, since it uses less digits than its factorization.

51236645601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17078881870.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 51236645601 in words is "fifty-one billion, two hundred thirty-six million, six hundred forty-five thousand, six hundred one".