656022819 has 4 divisors (see below), whose sum is σ = 874697096. Its totient is φ = 437348544.

The previous prime is 656022799. The next prime is 656022821. The reversal of 656022819 is 918220656.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 656022819 - 2¹⁶ = 655957283 is a prime.

It is a super-4 number, since 4×656022819⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656022869) 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, 109337134 + ... + 109337139.

It is an arithmetic number, because the mean of its divisors is an integer number (218674274).

Almost surely, 2^656022819 is an apocalyptic number.

656022819 is a deficient number, since it is larger than the sum of its proper divisors (218674277).

656022819 is a wasteful number, since it uses less digits than its factorization.

656022819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218674276.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 656022819 is about 25612.9424119916. The cubic root of 656022819 is about 868.9063719071.

The spelling of 656022819 in words is "six hundred fifty-six million, twenty-two thousand, eight hundred nineteen".