2166645492 has 72 divisors (see below), whose sum is σ = 6120459072. Its totient is φ = 640540800.

The previous prime is 2166645491. The next prime is 2166645497. The reversal of 2166645492 is 2945466612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166645491) 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, 50488 + ... + 82959.

It is an arithmetic number, because the mean of its divisors is an integer number (85006376).

Almost surely, 2^2166645492 is an apocalyptic number.

2166645492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2166645492 is an abundant number, since it is smaller than the sum of its proper divisors (3953813580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166645492 is a wasteful number, since it uses less digits than its factorization.

2166645492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133509 (or 133504 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 2166645492 is about 46547.2393596011. The cubic root of 2166645492 is about 1293.9851307429.

The spelling of 2166645492 in words is "two billion, one hundred sixty-six million, six hundred forty-five thousand, four hundred ninety-two".