51138222068 has 12 divisors (see below), whose sum is σ = 94201988160. Its totient is φ = 24223368312.

The previous prime is 51138222061. The next prime is 51138222089. The reversal of 51138222068 is 86022283115.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138222061) 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, 336435596 + ... + 336435747.

It is an arithmetic number, because the mean of its divisors is an integer number (7850165680).

Almost surely, 2^51138222068 is an apocalyptic number.

It is an amenable number.

51138222068 is a deficient number, since it is larger than the sum of its proper divisors (43063766092).

51138222068 is a wasteful number, since it uses less digits than its factorization.

51138222068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672871366 (or 672871364 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 51138222068 in words is "fifty-one billion, one hundred thirty-eight million, two hundred twenty-two thousand, sixty-eight".