64659919 has 2 divisors, whose sum is σ = 64659920. Its totient is φ = 64659918.

The previous prime is 64659901. The next prime is 64659941. The reversal of 64659919 is 91995646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64659919 is a prime.

It is a super-2 number, since 2×64659919² = 8361810250173122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64659949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32329959 + 32329960.

It is an arithmetic number, because the mean of its divisors is an integer number (32329960).

Almost surely, 2^64659919 is an apocalyptic number.

64659919 is a deficient number, since it is larger than the sum of its proper divisors (1).

64659919 is an equidigital number, since it uses as much as digits as its factorization.

64659919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 49.

The square root of 64659919 is about 8041.1391605916. The cubic root of 64659919 is about 401.3701327322.

It can be divided in two parts, 6465 and 9919, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 64659919 in words is "sixty-four million, six hundred fifty-nine thousand, nine hundred nineteen".