64261663 has 2 divisors, whose sum is σ = 64261664. Its totient is φ = 64261662.

The previous prime is 64261607. The next prime is 64261693. The reversal of 64261663 is 36616246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64261663 is a prime.

It is a super-2 number, since 2×64261663² = 8259122663051138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64261693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32130831 + 32130832.

It is an arithmetic number, because the mean of its divisors is an integer number (32130832).

Almost surely, 2^64261663 is an apocalyptic number.

64261663 is a deficient number, since it is larger than the sum of its proper divisors (1).

64261663 is an equidigital number, since it uses as much as digits as its factorization.

64261663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 34.

The square root of 64261663 is about 8016.3372558794. The cubic root of 64261663 is about 400.5443900127.

The spelling of 64261663 in words is "sixty-four million, two hundred sixty-one thousand, six hundred sixty-three".