1656790201 has 10 divisors (see below), whose sum is σ = 1822474010. Its totient is φ = 1506159600.

The previous prime is 1656790193. The next prime is 1656790217. The reversal of 1656790201 is 1020976561.

It can be written as a sum of positive squares in only one way, i.e., 1604082601 + 52707600 = 40051^2 + 7260^2 .

It is not a de Polignac number, because 1656790201 - 2³ = 1656790193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1656790241) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 41940 + ... + 71221.

It is an arithmetic number, because the mean of its divisors is an integer number (182247401).

Almost surely, 2^1656790201 is an apocalyptic number.

1656790201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1656790201 is a deficient number, since it is larger than the sum of its proper divisors (165683809).

1656790201 is an frugal number, since it uses more digits than its factorization.

1656790201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113205 (or 113172 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 1656790201 is about 40703.6878058979. The cubic root of 1656790201 is about 1183.2844911578.

The spelling of 1656790201 in words is "one billion, six hundred fifty-six million, seven hundred ninety thousand, two hundred one".