64380805633541 has 2 divisors, whose sum is σ = 64380805633542. Its totient is φ = 64380805633540.

The previous prime is 64380805633511. The next prime is 64380805633603. The reversal of 64380805633541 is 14533650808346.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63974882464900 + 405923168641 = 7998430^2 + 637121^2 .

It is a cyclic number.

It is not a de Polignac number, because 64380805633541 - 2²⁶ = 64380738524677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64380805633511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32190402816770 + 32190402816771.

It is an arithmetic number, because the mean of its divisors is an integer number (32190402816771).

Almost surely, 2^{64380805633541} is an apocalyptic number.

It is an amenable number.

64380805633541 is a deficient number, since it is larger than the sum of its proper divisors (1).

64380805633541 is an equidigital number, since it uses as much as digits as its factorization.

64380805633541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24883200, while the sum is 56.

The spelling of 64380805633541 in words is "sixty-four trillion, three hundred eighty billion, eight hundred five million, six hundred thirty-three thousand, five hundred forty-one".