51005977046621 has 2 divisors, whose sum is σ = 51005977046622. Its totient is φ = 51005977046620.

The previous prime is 51005977046617. The next prime is 51005977046657. The reversal of 51005977046621 is 12664077950015.

51005977046621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34073254072900 + 16932722973721 = 5837230^2 + 4114939^2 .

It is a cyclic number.

It is not a de Polignac number, because 51005977046621 - 2² = 51005977046617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51005977046671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25502988523310 + 25502988523311.

It is an arithmetic number, because the mean of its divisors is an integer number (25502988523311).

Almost surely, 2^{51005977046621} is an apocalyptic number.

It is an amenable number.

51005977046621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51005977046621 is an equidigital number, since it uses as much as digits as its factorization.

51005977046621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 51005977046621 in words is "fifty-one trillion, five billion, nine hundred seventy-seven million, forty-six thousand, six hundred twenty-one".