64663771 has 2 divisors, whose sum is σ = 64663772. Its totient is φ = 64663770.

The previous prime is 64663759. The next prime is 64663811. The reversal of 64663771 is 17736646.

It is an a-pointer prime, because the next prime (64663811) can be obtained adding 64663771 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64663771 is a prime.

It is not a weakly prime, because it can be changed into another prime (64663171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32331885 + 32331886.

It is an arithmetic number, because the mean of its divisors is an integer number (32331886).

Almost surely, 2^64663771 is an apocalyptic number.

64663771 is a deficient number, since it is larger than the sum of its proper divisors (1).

64663771 is an equidigital number, since it uses as much as digits as its factorization.

64663771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 40.

The square root of 64663771 is about 8041.3786753268. The cubic root of 64663771 is about 401.3781028785.

The spelling of 64663771 in words is "sixty-four million, six hundred sixty-three thousand, seven hundred seventy-one".