1656373543 has 16 divisors (see below), whose sum is σ = 1921107456. Its totient is φ = 1413137440.

The previous prime is 1656373513. The next prime is 1656373547. The reversal of 1656373543 is 3453736561.

It is not a de Polignac number, because 1656373543 - 2²⁵ = 1622819111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1656373543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656373547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48355 + ... + 75172.

It is an arithmetic number, because the mean of its divisors is an integer number (120069216).

Almost surely, 2^1656373543 is an apocalyptic number.

1656373543 is a deficient number, since it is larger than the sum of its proper divisors (264733913).

1656373543 is a wasteful number, since it uses less digits than its factorization.

1656373543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123614.

The product of its digits is 680400, while the sum is 43.

The square root of 1656373543 is about 40698.5692991781. The cubic root of 1656373543 is about 1183.1852900470.

The spelling of 1656373543 in words is "one billion, six hundred fifty-six million, three hundred seventy-three thousand, five hundred forty-three".