815923921223 has 2 divisors, whose sum is σ = 815923921224. Its totient is φ = 815923921222.

The previous prime is 815923921213. The next prime is 815923921237. The reversal of 815923921223 is 322129329518.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 815923921223 - 2⁸ = 815923920967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (815923921213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407961960611 + 407961960612.

It is an arithmetic number, because the mean of its divisors is an integer number (407961960612).

Almost surely, 2^815923921223 is an apocalyptic number.

815923921223 is a deficient number, since it is larger than the sum of its proper divisors (1).

815923921223 is an equidigital number, since it uses as much as digits as its factorization.

815923921223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The spelling of 815923921223 in words is "eight hundred fifteen billion, nine hundred twenty-three million, nine hundred twenty-one thousand, two hundred twenty-three".