51670290721 has 15 divisors (see below), whose sum is σ = 60291415761. Its totient is φ = 44279273556.

The previous prime is 51670290719. The next prime is 51670290731. The reversal of 51670290721 is 12709207615.

The square root of 51670290721 is 227311.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 51670290721 - 2¹ = 51670290719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51670290731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 11135920 + ... + 11140558.

Almost surely, 2^51670290721 is an apocalyptic number.

51670290721 is the 227311-st square number.

51670290721 is the 113656-th centered octagonal number.

It is an amenable number.

51670290721 is a deficient number, since it is larger than the sum of its proper divisors (8621125040).

51670290721 is an frugal number, since it uses more digits than its factorization.

51670290721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9306 (or 4646 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 51670290721 in words is "fifty-one billion, six hundred seventy million, two hundred ninety thousand, seven hundred twenty-one".