64156823 has 2 divisors, whose sum is σ = 64156824. Its totient is φ = 64156822.

The previous prime is 64156819. The next prime is 64156831. The reversal of 64156823 is 32865146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64156823 - 2² = 64156819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64156723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32078411 + 32078412.

It is an arithmetic number, because the mean of its divisors is an integer number (32078412).

Almost surely, 2^64156823 is an apocalyptic number.

64156823 is a deficient number, since it is larger than the sum of its proper divisors (1).

64156823 is an equidigital number, since it uses as much as digits as its factorization.

64156823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 64156823 is about 8009.7954405840. The cubic root of 64156823 is about 400.3264480900.

The spelling of 64156823 in words is "sixty-four million, one hundred fifty-six thousand, eight hundred twenty-three".