1656645323 has 4 divisors (see below), whose sum is σ = 1656957120. Its totient is φ = 1656333528.

The previous prime is 1656645307. The next prime is 1656645383. The reversal of 1656645323 is 3235466561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3235466561 = 271 ⋅11938991.

It is a cyclic number.

It is not a de Polignac number, because 1656645323 - 2⁴ = 1656645307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656645383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147788 + ... + 158601.

It is an arithmetic number, because the mean of its divisors is an integer number (414239280).

Almost surely, 2^1656645323 is an apocalyptic number.

1656645323 is a deficient number, since it is larger than the sum of its proper divisors (311797).

1656645323 is an equidigital number, since it uses as much as digits as its factorization.

1656645323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311796.

The product of its digits is 388800, while the sum is 41.

The square root of 1656645323 is about 40701.9081002353. The cubic root of 1656645323 is about 1183.2499993862.

The spelling of 1656645323 in words is "one billion, six hundred fifty-six million, six hundred forty-five thousand, three hundred twenty-three".