51456403775 has 24 divisors (see below), whose sum is σ = 72957517920. Its totient is φ = 35266757760.

The previous prime is 51456403771. The next prime is 51456403793. The reversal of 51456403775 is 57730465415.

It is not a de Polignac number, because 51456403775 - 2² = 51456403771 is a prime.

It is a super-2 number, since 2×51456403775² (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 (51456403771) 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, 282617 + ... + 427533.

It is an arithmetic number, because the mean of its divisors is an integer number (3039896580).

Almost surely, 2^51456403775 is an apocalyptic number.

51456403775 is a deficient number, since it is larger than the sum of its proper divisors (21501114145).

51456403775 is a wasteful number, since it uses less digits than its factorization.

51456403775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146963 (or 146958 counting only the distinct ones).

The product of its (nonzero) digits is 1764000, while the sum is 47.

It can be divided in two parts, 5145640 and 3775, that added together give a palindrome (5149415).

The spelling of 51456403775 in words is "fifty-one billion, four hundred fifty-six million, four hundred three thousand, seven hundred seventy-five".