51138285023 has 4 divisors (see below), whose sum is σ = 58443754320. Its totient is φ = 43832815728.

The previous prime is 51138285019. The next prime is 51138285101. The reversal of 51138285023 is 32058283115.

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 51138285023 - 2² = 51138285019 is a prime.

It is a super-2 number, since 2×51138285023² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138285323) 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, 3652734638 + ... + 3652734651.

It is an arithmetic number, because the mean of its divisors is an integer number (14610938580).

Almost surely, 2^51138285023 is an apocalyptic number.

51138285023 is a deficient number, since it is larger than the sum of its proper divisors (7305469297).

51138285023 is an equidigital number, since it uses as much as digits as its factorization.

51138285023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7305469296.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 51138285023 in words is "fifty-one billion, one hundred thirty-eight million, two hundred eighty-five thousand, twenty-three".