51470940681 has 12 divisors (see below), whose sum is σ = 78720262452. Its totient is φ = 32295492096.

The previous prime is 51470940673. The next prime is 51470940683. The reversal of 51470940681 is 18604907415.

51470940681 is a `hidden beast` number, since 514 + 70 + 9 + 4 + 0 + 68 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25212358656 + 26258582025 = 158784^2 + 162045^2 .

It is not a de Polignac number, because 51470940681 - 2³ = 51470940673 is a prime.

It is a super-2 number, since 2×51470940681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51470940683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168205536 + ... + 168205841.

It is an arithmetic number, because the mean of its divisors is an integer number (6560021871).

Almost surely, 2^51470940681 is an apocalyptic number.

51470940681 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51470940681 is a deficient number, since it is larger than the sum of its proper divisors (27249321771).

51470940681 is a wasteful number, since it uses less digits than its factorization.

51470940681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336411400 (or 336411397 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 51470940681 in words is "fifty-one billion, four hundred seventy million, nine hundred forty thousand, six hundred eighty-one".