51764500909081 has 4 divisors (see below), whose sum is σ = 52277020720164. Its totient is φ = 51251981098000.

The previous prime is 51764500909063. The next prime is 51764500909109. The reversal of 51764500909081 is 18090900546715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40013721409600 + 11750779499481 = 6325640^2 + 3427941^2 .

It is a cyclic number.

It is not a de Polignac number, because 51764500909081 - 2⁹ = 51764500908569 is a prime.

It is a super-2 number, since 2×51764500909081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51764500909001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256259905390 + ... + 256259905591.

It is an arithmetic number, because the mean of its divisors is an integer number (13069255180041).

Almost surely, 2^{51764500909081} is an apocalyptic number.

It is an amenable number.

51764500909081 is a deficient number, since it is larger than the sum of its proper divisors (512519811083).

51764500909081 is a wasteful number, since it uses less digits than its factorization.

51764500909081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512519811082.

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 51764500909081 in words is "fifty-one trillion, seven hundred sixty-four billion, five hundred million, nine hundred nine thousand, eighty-one".