1656161641 has 8 divisors (see below), whose sum is σ = 1794364704. Its totient is φ = 1522489920.

The previous prime is 1656161629. The next prime is 1656161653. The reversal of 1656161641 is 1461616561.

It is an interprime number because it is at equal distance from previous prime (1656161629) and next prime (1656161653).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656161641 is a prime.

It is a super-2 number, since 2×1656161641² = 5485742762239625762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1656161641.

It is not an unprimeable number, because it can be changed into a prime (1656161681) 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, 1132075 + ... + 1133536.

It is an arithmetic number, because the mean of its divisors is an integer number (224295588).

Almost surely, 2^1656161641 is an apocalyptic number.

It is an amenable number.

1656161641 is a deficient number, since it is larger than the sum of its proper divisors (138203063).

1656161641 is a wasteful number, since it uses less digits than its factorization.

1656161641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265671.

The product of its digits is 25920, while the sum is 37.

The square root of 1656161641 is about 40695.9659057258. The cubic root of 1656161641 is about 1183.1348324228.

The spelling of 1656161641 in words is "one billion, six hundred fifty-six million, one hundred sixty-one thousand, six hundred forty-one".