1656155161 has 8 divisors (see below), whose sum is σ = 1680453864. Its totient is φ = 1631900160.

The previous prime is 1656155141. The next prime is 1656155177. The reversal of 1656155161 is 1615516561.

It can be written as a sum of positive squares in 4 ways, for example, as 9418761 + 1646736400 = 3069^2 + 40580^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1656155161 - 2²¹ = 1654058009 is a prime.

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 1656155161.

It is not an unprimeable number, because it can be changed into a prime (1656155101) 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, 69741 + ... + 90421.

It is an arithmetic number, because the mean of its divisors is an integer number (210056733).

Almost surely, 2^1656155161 is an apocalyptic number.

It is an amenable number.

1656155161 is a deficient number, since it is larger than the sum of its proper divisors (24298703).

1656155161 is a wasteful number, since it uses less digits than its factorization.

1656155161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21851.

The product of its digits is 27000, while the sum is 37.

The square root of 1656155161 is about 40695.8862908771. The cubic root of 1656155161 is about 1183.1332893520.

The spelling of 1656155161 in words is "one billion, six hundred fifty-six million, one hundred fifty-five thousand, one hundred sixty-one".