51720272651 has 16 divisors (see below), whose sum is σ = 53648438400. Its totient is φ = 49831592448.

The previous prime is 51720272641. The next prime is 51720272657. The reversal of 51720272651 is 15627202715.

It is a cyclic number.

It is not a de Polignac number, because 51720272651 - 2⁶ = 51720272587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51720272657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 930911 + ... + 984903.

It is an arithmetic number, because the mean of its divisors is an integer number (3353027400).

Almost surely, 2^51720272651 is an apocalyptic number.

51720272651 is a deficient number, since it is larger than the sum of its proper divisors (1928165749).

51720272651 is a wasteful number, since it uses less digits than its factorization.

51720272651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54358.

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 51720272651 in words is "fifty-one billion, seven hundred twenty million, two hundred seventy-two thousand, six hundred fifty-one".