51411661731 has 48 divisors (see below), whose sum is σ = 77576558592. Its totient is φ = 32773248000.

The previous prime is 51411661661. The next prime is 51411661757. The reversal of 51411661731 is 13716611415.

It is a happy number.

51411661731 is a `hidden beast` number, since 5 + 1 + 4 + 1 + 1 + 6 + 617 + 31 = 666.

It is not a de Polignac number, because 51411661731 - 2¹³ = 51411653539 is a prime.

It is a super-2 number, since 2×51411661731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51411611731) 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 47 ways as a sum of consecutive naturals, for example, 8127736 + ... + 8134058.

It is an arithmetic number, because the mean of its divisors is an integer number (1616178304).

Almost surely, 2^51411661731 is an apocalyptic number.

51411661731 is a deficient number, since it is larger than the sum of its proper divisors (26164896861).

51411661731 is a wasteful number, since it uses less digits than its factorization.

51411661731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704 (or 6701 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The spelling of 51411661731 in words is "fifty-one billion, four hundred eleven million, six hundred sixty-one thousand, seven hundred thirty-one".