51655907065 has 12 divisors (see below), whose sum is σ = 72107429796. Its totient is φ = 35421193248.

The previous prime is 51655907047. The next prime is 51655907101. The reversal of 51655907065 is 56070955615.

It can be written as a sum of positive squares in 2 ways, for example, as 32374085184 + 19281821881 = 179928^2 + 138859^2 .

It is not a de Polignac number, because 51655907065 - 2⁵ = 51655907033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105419974 + ... + 105420463.

It is an arithmetic number, because the mean of its divisors is an integer number (6008952483).

Almost surely, 2^51655907065 is an apocalyptic number.

It is an amenable number.

51655907065 is a deficient number, since it is larger than the sum of its proper divisors (20451522731).

51655907065 is a wasteful number, since it uses less digits than its factorization.

51655907065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210840456 (or 210840449 counting only the distinct ones).

The product of its (nonzero) digits is 1417500, while the sum is 49.

The spelling of 51655907065 in words is "fifty-one billion, six hundred fifty-five million, nine hundred seven thousand, sixty-five".