51151155015557 has 4 divisors (see below), whose sum is σ = 52116271147980. Its totient is φ = 50186038883136.

The previous prime is 51151155015509. The next prime is 51151155015589. The reversal of 51151155015557 is 75551055115115.

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 27335183629636 + 23815971385921 = 5228306^2 + 4880161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51151155015557 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 (51151155012557) 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, 482558066132 + ... + 482558066237.

It is an arithmetic number, because the mean of its divisors is an integer number (13029067786995).

Almost surely, 2^{51151155015557} is an apocalyptic number.

It is an amenable number.

51151155015557 is a deficient number, since it is larger than the sum of its proper divisors (965116132423).

51151155015557 is an equidigital number, since it uses as much as digits as its factorization.

51151155015557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965116132422.

The product of its (nonzero) digits is 546875, while the sum is 47.

The spelling of 51151155015557 in words is "fifty-one trillion, one hundred fifty-one billion, one hundred fifty-five million, fifteen thousand, five hundred fifty-seven".