64768760491 has 2 divisors, whose sum is σ = 64768760492. Its totient is φ = 64768760490.

The previous prime is 64768760477. The next prime is 64768760549. The reversal of 64768760491 is 19406786746.

64768760491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (64768760549) can be obtained adding 64768760491 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64768760491 is a prime.

It is a super-2 number, since 2×64768760491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64768760431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32384380245 + 32384380246.

It is an arithmetic number, because the mean of its divisors is an integer number (32384380246).

Almost surely, 2^64768760491 is an apocalyptic number.

64768760491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64768760491 is an equidigital number, since it uses as much as digits as its factorization.

64768760491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 64768760491 in words is "sixty-four billion, seven hundred sixty-eight million, seven hundred sixty thousand, four hundred ninety-one".