64919623 has 2 divisors, whose sum is σ = 64919624. Its totient is φ = 64919622.

The previous prime is 64919609. The next prime is 64919627. The reversal of 64919623 is 32691946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64919623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64919627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32459811 + 32459812.

It is an arithmetic number, because the mean of its divisors is an integer number (32459812).

Almost surely, 2^64919623 is an apocalyptic number.

64919623 is a deficient number, since it is larger than the sum of its proper divisors (1).

64919623 is an equidigital number, since it uses as much as digits as its factorization.

64919623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 40.

The square root of 64919623 is about 8057.2714364107. The cubic root of 64919623 is about 401.9067773077.

The spelling of 64919623 in words is "sixty-four million, nine hundred nineteen thousand, six hundred twenty-three".