51621084575261 has 4 divisors (see below), whose sum is σ = 51683504267232. Its totient is φ = 51558664883292.

The previous prime is 51621084575227. The next prime is 51621084575293. The reversal of 51621084575261 is 16257548012615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51621084575261 - 2⁶ = 51621084575197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51621084505261) 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, 31209844745 + ... + 31209846398.

It is an arithmetic number, because the mean of its divisors is an integer number (12920876066808).

Almost surely, 2^{51621084575261} is an apocalyptic number.

It is an amenable number.

51621084575261 is a deficient number, since it is larger than the sum of its proper divisors (62419691971).

51621084575261 is an equidigital number, since it uses as much as digits as its factorization.

51621084575261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62419691970.

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 51621084575261 in words is "fifty-one trillion, six hundred twenty-one billion, eighty-four million, five hundred seventy-five thousand, two hundred sixty-one".