51218940007 has 4 divisors (see below), whose sum is σ = 52308704736. Its totient is φ = 50129175280.

The previous prime is 51218939971. The next prime is 51218940023. The reversal of 51218940007 is 70004981215.

51218940007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51218940007 - 2²⁷ = 51084722279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51218970007) 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, 544882294 + ... + 544882387.

It is an arithmetic number, because the mean of its divisors is an integer number (13077176184).

Almost surely, 2^51218940007 is an apocalyptic number.

51218940007 is a deficient number, since it is larger than the sum of its proper divisors (1089764729).

51218940007 is a wasteful number, since it uses less digits than its factorization.

51218940007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089764728.

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 51218940007 in words is "fifty-one billion, two hundred eighteen million, nine hundred forty thousand, seven".