656143541 has 4 divisors (see below), whose sum is σ = 672147084. Its totient is φ = 640140000.

The previous prime is 656143513. The next prime is 656143559. The reversal of 656143541 is 145341656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37576900 + 618566641 = 6130^2 + 24871^2 .

It is a cyclic number.

It is not a de Polignac number, because 656143541 - 2¹⁰ = 656142517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656143561) 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, 8001710 + ... + 8001791.

It is an arithmetic number, because the mean of its divisors is an integer number (168036771).

Almost surely, 2^656143541 is an apocalyptic number.

It is an amenable number.

656143541 is a deficient number, since it is larger than the sum of its proper divisors (16003543).

656143541 is a wasteful number, since it uses less digits than its factorization.

656143541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16003542.

The product of its digits is 43200, while the sum is 35.

The square root of 656143541 is about 25615.2989637053. The cubic root of 656143541 is about 868.9596676555.

The spelling of 656143541 in words is "six hundred fifty-six million, one hundred forty-three thousand, five hundred forty-one".