4644640461551 has 2 divisors, whose sum is σ = 4644640461552. Its totient is φ = 4644640461550.

The previous prime is 4644640461403. The next prime is 4644640461557. The reversal of 4644640461551 is 1551640464464.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4644640461551 - 2³⁸ = 4369762554607 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4644640461551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4644640461557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2322320230775 + 2322320230776.

It is an arithmetic number, because the mean of its divisors is an integer number (2322320230776).

Almost surely, 2^{4644640461551} is an apocalyptic number.

4644640461551 is a deficient number, since it is larger than the sum of its proper divisors (1).

4644640461551 is an equidigital number, since it uses as much as digits as its factorization.

4644640461551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5529600, while the sum is 50.

The spelling of 4644640461551 in words is "four trillion, six hundred forty-four billion, six hundred forty million, four hundred sixty-one thousand, five hundred fifty-one".