64920402892789 has 2 divisors, whose sum is σ = 64920402892790. Its totient is φ = 64920402892788.

The previous prime is 64920402892781. The next prime is 64920402892883. The reversal of 64920402892789 is 98729820402946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47877888778225 + 17042514114564 = 6919385^2 + 4128258^2 .

It is a cyclic number.

It is not a de Polignac number, because 64920402892789 - 2³ = 64920402892781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64920402892781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32460201446394 + 32460201446395.

It is an arithmetic number, because the mean of its divisors is an integer number (32460201446395).

Almost surely, 2^{64920402892789} is an apocalyptic number.

It is an amenable number.

64920402892789 is a deficient number, since it is larger than the sum of its proper divisors (1).

64920402892789 is an equidigital number, since it uses as much as digits as its factorization.

64920402892789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250822656, while the sum is 70.

The spelling of 64920402892789 in words is "sixty-four trillion, nine hundred twenty billion, four hundred two million, eight hundred ninety-two thousand, seven hundred eighty-nine".