51690720039 has 16 divisors (see below), whose sum is σ = 78795002112. Its totient is φ = 29526982848.

The previous prime is 51690719989. The next prime is 51690720071. The reversal of 51690720039 is 93002709615.

It is not a de Polignac number, because 51690720039 - 2⁹ = 51690719527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690720089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380214 + ... + 497939.

It is an arithmetic number, because the mean of its divisors is an integer number (4924687632).

Almost surely, 2^51690720039 is an apocalyptic number.

51690720039 is a deficient number, since it is larger than the sum of its proper divisors (27104282073).

51690720039 is a wasteful number, since it uses less digits than its factorization.

51690720039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880966.

The product of its (nonzero) digits is 102060, while the sum is 42.

The spelling of 51690720039 in words is "fifty-one billion, six hundred ninety million, seven hundred twenty thousand, thirty-nine".