2162077861 has 12 divisors (see below), whose sum is σ = 2246749380. Its totient is φ = 2078119680.

The previous prime is 2162077847. The next prime is 2162077877. The reversal of 2162077861 is 1687702612.

It can be written as a sum of positive squares in 6 ways, for example, as 1645924900 + 516152961 = 40570^2 + 22719^2 .

It is not a de Polignac number, because 2162077861 - 2⁵ = 2162077829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2162077061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2840721 + ... + 2841481.

It is an arithmetic number, because the mean of its divisors is an integer number (187229115).

Almost surely, 2^2162077861 is an apocalyptic number.

It is an amenable number.

2162077861 is a deficient number, since it is larger than the sum of its proper divisors (84671519).

2162077861 is an frugal number, since it uses more digits than its factorization.

2162077861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1416 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 2162077861 is about 46498.1490061701. The cubic root of 2162077861 is about 1293.0751826419.

The spelling of 2162077861 in words is "two billion, one hundred sixty-two million, seventy-seven thousand, eight hundred sixty-one".