656161693 has 4 divisors (see below), whose sum is σ = 715812768. Its totient is φ = 596510620.

The previous prime is 656161691. The next prime is 656161697. The reversal of 656161693 is 396161656.

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 656161693 - 2¹ = 656161691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656161691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29825521 + ... + 29825542.

It is an arithmetic number, because the mean of its divisors is an integer number (178953192).

Almost surely, 2^656161693 is an apocalyptic number.

It is an amenable number.

656161693 is a deficient number, since it is larger than the sum of its proper divisors (59651075).

656161693 is a wasteful number, since it uses less digits than its factorization.

656161693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59651074.

The product of its digits is 174960, while the sum is 43.

The square root of 656161693 is about 25615.6532807578. The cubic root of 656161693 is about 868.9676807449.

The spelling of 656161693 in words is "six hundred fifty-six million, one hundred sixty-one thousand, six hundred ninety-three".