64476691 has 2 divisors, whose sum is σ = 64476692. Its totient is φ = 64476690.

The previous prime is 64476623. The next prime is 64476707. The reversal of 64476691 is 19667446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64476691 - 2²¹ = 62379539 is a prime.

It is not a weakly prime, because it can be changed into another prime (64476611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32238345 + 32238346.

It is an arithmetic number, because the mean of its divisors is an integer number (32238346).

Almost surely, 2^64476691 is an apocalyptic number.

64476691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64476691 is an equidigital number, since it uses as much as digits as its factorization.

64476691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 64476691 is about 8029.7379160219. The cubic root of 64476691 is about 400.9906507523.

The spelling of 64476691 in words is "sixty-four million, four hundred seventy-six thousand, six hundred ninety-one".