664012499 has 2 divisors, whose sum is σ = 664012500. Its totient is φ = 664012498.

The previous prime is 664012463. The next prime is 664012549. The reversal of 664012499 is 994210466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664012499 - 2¹² = 664008403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664012409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332006249 + 332006250.

It is an arithmetic number, because the mean of its divisors is an integer number (332006250).

Almost surely, 2^664012499 is an apocalyptic number.

664012499 is a deficient number, since it is larger than the sum of its proper divisors (1).

664012499 is an equidigital number, since it uses as much as digits as its factorization.

664012499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 664012499 is about 25768.4399799445. The cubic root of 664012499 is about 872.4196083049.

The spelling of 664012499 in words is "six hundred sixty-four million, twelve thousand, four hundred ninety-nine".