51531512777 has 8 divisors (see below), whose sum is σ = 54256536960. Its totient is φ = 48807772560.

The previous prime is 51531512749. The next prime is 51531512779. The reversal of 51531512777 is 77721513515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51531512777 - 2¹⁶ = 51531447241 is a prime.

It is a super-2 number, since 2×51531512777² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51531512779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238049 + ... + 399662.

It is an arithmetic number, because the mean of its divisors is an integer number (6782067120).

Almost surely, 2^51531512777 is an apocalyptic number.

It is an amenable number.

51531512777 is a deficient number, since it is larger than the sum of its proper divisors (2725024183).

51531512777 is a wasteful number, since it uses less digits than its factorization.

51531512777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641983.

The product of its digits is 257250, while the sum is 44.

The spelling of 51531512777 in words is "fifty-one billion, five hundred thirty-one million, five hundred twelve thousand, seven hundred seventy-seven".