656425181 has 4 divisors (see below), whose sum is σ = 659724000. Its totient is φ = 653126364.

The previous prime is 656425157. The next prime is 656425201. The reversal of 656425181 is 181524656.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656425181 - 2¹⁰ = 656424157 is a prime.

It is a super-2 number, since 2×656425181² = 861788036501765522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656425381) 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, 1649111 + ... + 1649508.

It is an arithmetic number, because the mean of its divisors is an integer number (164931000).

Almost surely, 2^656425181 is an apocalyptic number.

It is an amenable number.

656425181 is a deficient number, since it is larger than the sum of its proper divisors (3298819).

656425181 is a wasteful number, since it uses less digits than its factorization.

656425181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3298818.

The product of its digits is 57600, while the sum is 38.

The square root of 656425181 is about 25620.7958697617. The cubic root of 656425181 is about 869.0839792722.

It can be divided in two parts, 65 and 6425181, that added together give a palindrome (6425246).

The spelling of 656425181 in words is "six hundred fifty-six million, four hundred twenty-five thousand, one hundred eighty-one".