64505899 has 2 divisors, whose sum is σ = 64505900. Its totient is φ = 64505898.

The previous prime is 64505897. The next prime is 64505923. The reversal of 64505899 is 99850546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64505899 - 2¹ = 64505897 is a prime.

It is a super-2 number, since 2×64505899² = 8322022011596402, which contains 22 as substring.

Together with 64505897, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64505897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32252949 + 32252950.

It is an arithmetic number, because the mean of its divisors is an integer number (32252950).

Almost surely, 2^64505899 is an apocalyptic number.

64505899 is a deficient number, since it is larger than the sum of its proper divisors (1).

64505899 is an equidigital number, since it uses as much as digits as its factorization.

64505899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 64505899 is about 8031.5564494063. The cubic root of 64505899 is about 401.0511913221.

The spelling of 64505899 in words is "sixty-four million, five hundred five thousand, eight hundred ninety-nine".