51720049107 has 12 divisors (see below), whose sum is σ = 74856457000. Its totient is φ = 34410931488.

The previous prime is 51720049103. The next prime is 51720049109. The reversal of 51720049107 is 70194002715.

It is a happy number.

It is not a de Polignac number, because 51720049107 - 2² = 51720049103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51720049103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5753698 + ... + 5762679.

Almost surely, 2^51720049107 is an apocalyptic number.

51720049107 is a deficient number, since it is larger than the sum of its proper divisors (23136407893).

51720049107 is a wasteful number, since it uses less digits than its factorization.

51720049107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11516882 (or 11516879 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 51720049107 in words is "fifty-one billion, seven hundred twenty million, forty-nine thousand, one hundred seven".