2156777693 has 16 divisors (see below), whose sum is σ = 2534148864. Its totient is φ = 1796826240.

The previous prime is 2156777687. The next prime is 2156777713. The reversal of 2156777693 is 3967776512.

It is a cyclic number.

It is not a de Polignac number, because 2156777693 - 2⁶ = 2156777629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156777603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280328 + ... + 287918.

It is an arithmetic number, because the mean of its divisors is an integer number (158384304).

Almost surely, 2^2156777693 is an apocalyptic number.

It is an amenable number.

2156777693 is a deficient number, since it is larger than the sum of its proper divisors (377371171).

2156777693 is a wasteful number, since it uses less digits than its factorization.

2156777693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8732.

The product of its digits is 3333960, while the sum is 53.

The square root of 2156777693 is about 46441.1207121447. The cubic root of 2156777693 is about 1292.0176931843.

The spelling of 2156777693 in words is "two billion, one hundred fifty-six million, seven hundred seventy-seven thousand, six hundred ninety-three".