656100001 has 16 divisors (see below), whose sum is σ = 732902400. Its totient is φ = 584443728.

The previous prime is 656099993. The next prime is 656100013. The reversal of 656100001 is 100001656.

It is a cyclic number.

It is not a de Polignac number, because 656100001 - 2³ = 656099993 is a prime.

It is a super-2 number, since 2×656100001² = 860934422624400002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656100061) 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, 13060 + ... + 38506.

It is an arithmetic number, because the mean of its divisors is an integer number (45806400).

Almost surely, 2^656100001 is an apocalyptic number.

It is an amenable number.

656100001 is a deficient number, since it is larger than the sum of its proper divisors (76802399).

656100001 is a wasteful number, since it uses less digits than its factorization.

656100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25548.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 656100001 is about 25614.4490668841. The cubic root of 656100001 is about 868.9404465865.

Adding to 656100001 its reverse (100001656), we get a palindrome (756101657).

It can be divided in two parts, 656 and 100001, that multiplied together give a palindrome (65600656).

The spelling of 656100001 in words is "six hundred fifty-six million, one hundred thousand, one".