1656433623 has 16 divisors (see below), whose sum is σ = 2503652480. Its totient is φ = 965693664.

The previous prime is 1656433591. The next prime is 1656433657. The reversal of 1656433623 is 3263346561.

It is not a de Polignac number, because 1656433623 - 2⁵ = 1656433591 is a prime.

It is a super-2 number, since 2×1656433623² = 5487544694809812258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656433123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1116961 + ... + 1118442.

It is an arithmetic number, because the mean of its divisors is an integer number (156478280).

Almost surely, 2^1656433623 is an apocalyptic number.

1656433623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1656433623 is a deficient number, since it is larger than the sum of its proper divisors (847218857).

1656433623 is a wasteful number, since it uses less digits than its factorization.

1656433623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235438.

The product of its digits is 233280, while the sum is 39.

The square root of 1656433623 is about 40699.3074019694. The cubic root of 1656433623 is about 1183.1995953775.

The spelling of 1656433623 in words is "one billion, six hundred fifty-six million, four hundred thirty-three thousand, six hundred twenty-three".