64416691 has 2 divisors, whose sum is σ = 64416692. Its totient is φ = 64416690.

The previous prime is 64416673. The next prime is 64416697. The reversal of 64416691 is 19661446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64416691 - 2⁷ = 64416563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64416691.

It is not a weakly prime, because it can be changed into another prime (64416697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32208345 + 32208346.

It is an arithmetic number, because the mean of its divisors is an integer number (32208346).

Almost surely, 2^64416691 is an apocalyptic number.

64416691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64416691 is an equidigital number, since it uses as much as digits as its factorization.

64416691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 64416691 is about 8026.0009344629. Note that the first 3 decimals coincide. The cubic root of 64416691 is about 400.8662290141.

The spelling of 64416691 in words is "sixty-four million, four hundred sixteen thousand, six hundred ninety-one".