2161670751 has 24 divisors (see below), whose sum is σ = 3315639600. Its totient is φ = 1352422656.

The previous prime is 2161670747. The next prime is 2161670783. The reversal of 2161670751 is 1570761612.

2161670751 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161670751 - 2² = 2161670747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161670741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33156 + ... + 73638.

It is an arithmetic number, because the mean of its divisors is an integer number (138151650).

Almost surely, 2^2161670751 is an apocalyptic number.

2161670751 is a deficient number, since it is larger than the sum of its proper divisors (1153968849).

2161670751 is a wasteful number, since it uses less digits than its factorization.

2161670751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40855 (or 40852 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 2161670751 is about 46493.7710989332. The cubic root of 2161670751 is about 1292.9940173746.

The spelling of 2161670751 in words is "two billion, one hundred sixty-one million, six hundred seventy thousand, seven hundred fifty-one".