51015561501 has 16 divisors (see below), whose sum is σ = 69623301440. Its totient is φ = 33209568000.

The previous prime is 51015561481. The next prime is 51015561503. The reversal of 51015561501 is 10516551015.

51015561501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51015561501 - 2¹¹ = 51015559453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51015561503) 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, 390501 + ... + 504501.

It is an arithmetic number, because the mean of its divisors is an integer number (4351456340).

Almost surely, 2^51015561501 is an apocalyptic number.

It is an amenable number.

51015561501 is a deficient number, since it is larger than the sum of its proper divisors (18607739939).

51015561501 is a wasteful number, since it uses less digits than its factorization.

51015561501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117516.

The product of its (nonzero) digits is 3750, while the sum is 30.

The spelling of 51015561501 in words is "fifty-one billion, fifteen million, five hundred sixty-one thousand, five hundred one".