51123277557 has 24 divisors (see below), whose sum is σ = 85296594240. Its totient is φ = 29161226880.

The previous prime is 51123277547. The next prime is 51123277567. The reversal of 51123277557 is 75577232115.

51123277557 is a `hidden beast` number, since 5 + 1 + 1 + 23 + 2 + 77 + 557 = 666.

It is an interprime number because it is at equal distance from previous prime (51123277547) and next prime (51123277567).

It is not a de Polignac number, because 51123277557 - 2¹⁴ = 51123261173 is a prime.

It is a super-2 number, since 2×51123277557² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123277547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15186457 + ... + 15189822.

It is an arithmetic number, because the mean of its divisors is an integer number (3554024760).

Almost surely, 2^51123277557 is an apocalyptic number.

It is an amenable number.

51123277557 is a deficient number, since it is larger than the sum of its proper divisors (34173316683).

51123277557 is a wasteful number, since it uses less digits than its factorization.

51123277557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30376313 (or 30376310 counting only the distinct ones).

The product of its digits is 514500, while the sum is 45.

The spelling of 51123277557 in words is "fifty-one billion, one hundred twenty-three million, two hundred seventy-seven thousand, five hundred fifty-seven".