64403021187997 has 2 divisors, whose sum is σ = 64403021187998. Its totient is φ = 64403021187996.

The previous prime is 64403021187983. The next prime is 64403021188087. The reversal of 64403021187997 is 79978112030446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63883668911076 + 519352276921 = 7992726^2 + 720661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64403021187997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64403021187397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32201510593998 + 32201510593999.

It is an arithmetic number, because the mean of its divisors is an integer number (32201510593999).

Almost surely, 2^{64403021187997} is an apocalyptic number.

It is an amenable number.

64403021187997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64403021187997 is an equidigital number, since it uses as much as digits as its factorization.

64403021187997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 61.

The spelling of 64403021187997 in words is "sixty-four trillion, four hundred three billion, twenty-one million, one hundred eighty-seven thousand, nine hundred ninety-seven".