1656388296 has 72 divisors (see below), whose sum is σ = 4541625270. Its totient is φ = 545315328.

The previous prime is 1656388259. The next prime is 1656388297. The reversal of 1656388296 is 6928836561.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1442936196 + 213452100 = 37986^2 + 14610^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656388297) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3400965 + ... + 3401451.

Almost surely, 2^1656388296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1656388296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270812635).

1656388296 is an abundant number, since it is smaller than the sum of its proper divisors (2885236974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1656388296 is an equidigital number, since it uses as much as digits as its factorization.

1656388296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 589 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 1656388296 is about 40698.7505459320. The cubic root of 1656388296 is about 1183.1888028378.

The spelling of 1656388296 in words is "one billion, six hundred fifty-six million, three hundred eighty-eight thousand, two hundred ninety-six".