2156061605 has 8 divisors (see below), whose sum is σ = 2587664664. Its totient is φ = 1724588800.

The previous prime is 2156061599. The next prime is 2156061617. The reversal of 2156061605 is 5061606512.

It can be written as a sum of positive squares in 4 ways, for example, as 78251716 + 2077809889 = 8846^2 + 45583^2 .

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

It is not a de Polignac number, because 2156061605 - 2²⁸ = 1887626149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8585 + ... + 66225.

It is an arithmetic number, because the mean of its divisors is an integer number (323458083).

Almost surely, 2^2156061605 is an apocalyptic number.

It is an amenable number.

2156061605 is a deficient number, since it is larger than the sum of its proper divisors (431603059).

2156061605 is an equidigital number, since it uses as much as digits as its factorization.

2156061605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65127.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 2156061605 is about 46433.4104390362. The cubic root of 2156061605 is about 1291.8746865156.

The spelling of 2156061605 in words is "two billion, one hundred fifty-six million, sixty-one thousand, six hundred five".