1656161320 has 32 divisors (see below), whose sum is σ = 4065124320. Its totient is φ = 602240320.

The previous prime is 1656161263. The next prime is 1656161321. The reversal of 1656161320 is 231616561.

It is not an unprimeable number, because it can be changed into a prime (1656161321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881562 + ... + 1882441.

It is an arithmetic number, because the mean of its divisors is an integer number (127035135).

Almost surely, 2^1656161320 is an apocalyptic number.

1656161320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1656161320 is an abundant number, since it is smaller than the sum of its proper divisors (2408963000).

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

1656161320 is a wasteful number, since it uses less digits than its factorization.

1656161320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764025 (or 3764021 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1656161320 is about 40695.9619618458. The cubic root of 1656161320 is about 1183.1347559837.

Adding to 1656161320 its reverse (231616561), we get a palindrome (1887777881).

The spelling of 1656161320 in words is "one billion, six hundred fifty-six million, one hundred sixty-one thousand, three hundred twenty".