2161670757 has 16 divisors (see below), whose sum is σ = 2994122880. Its totient is φ = 1386156800.

The previous prime is 2161670747. The next prime is 2161670783. The reversal of 2161670757 is 7570761612.

It is a cyclic number.

It is not a de Polignac number, because 2161670757 - 2⁴ = 2161670741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161670747) 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, 115032 + ... + 132497.

It is an arithmetic number, because the mean of its divisors is an integer number (187132680).

Almost surely, 2^2161670757 is an apocalyptic number.

It is an amenable number.

2161670757 is a deficient number, since it is larger than the sum of its proper divisors (832452123).

2161670757 is a wasteful number, since it uses less digits than its factorization.

2161670757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247644.

The product of its (nonzero) digits is 123480, while the sum is 42.

The square root of 2161670757 is about 46493.7711634580. The cubic root of 2161670757 is about 1292.9940185709.

The spelling of 2161670757 in words is "two billion, one hundred sixty-one million, six hundred seventy thousand, seven hundred fifty-seven".