51010511557 has 4 divisors (see below), whose sum is σ = 51040643500. Its totient is φ = 50980379616.

The previous prime is 51010511549. The next prime is 51010511621. The reversal of 51010511557 is 75511501015.

51010511557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18845523841 + 32164987716 = 137279^2 + 179346^2 .

It is a cyclic number.

It is not a de Polignac number, because 51010511557 - 2³ = 51010511549 is a prime.

It is a super-3 number, since 3×51010511557³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51010511257) 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, 15063432 + ... + 15066817.

It is an arithmetic number, because the mean of its divisors is an integer number (12760160875).

Almost surely, 2^51010511557 is an apocalyptic number.

It is an amenable number.

51010511557 is a deficient number, since it is larger than the sum of its proper divisors (30131943).

51010511557 is a wasteful number, since it uses less digits than its factorization.

51010511557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30131942.

The product of its (nonzero) digits is 4375, while the sum is 31.

The spelling of 51010511557 in words is "fifty-one billion, ten million, five hundred eleven thousand, five hundred fifty-seven".