64766006491 has 2 divisors, whose sum is σ = 64766006492. Its totient is φ = 64766006490.

The previous prime is 64766006453. The next prime is 64766006509. The reversal of 64766006491 is 19460066746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64766006491 - 2³¹ = 62618522843 is a prime.

It is not a weakly prime, because it can be changed into another prime (64766006441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32383003245 + 32383003246.

It is an arithmetic number, because the mean of its divisors is an integer number (32383003246).

Almost surely, 2^64766006491 is an apocalyptic number.

64766006491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64766006491 is an equidigital number, since it uses as much as digits as its factorization.

64766006491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The spelling of 64766006491 in words is "sixty-four billion, seven hundred sixty-six million, six thousand, four hundred ninety-one".