2166951420 has 48 divisors (see below), whose sum is σ = 6741628320. Its totient is φ = 577853568.

The previous prime is 2166951407. The next prime is 2166951421. The reversal of 2166951420 is 241596612.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166951421) 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, 2005897 + ... + 2006976.

It is an arithmetic number, because the mean of its divisors is an integer number (140450590).

Almost surely, 2^2166951420 is an apocalyptic number.

2166951420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2166951420 is an abundant number, since it is smaller than the sum of its proper divisors (4574676900).

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

2166951420 is a wasteful number, since it uses less digits than its factorization.

2166951420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012891 (or 4012883 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 2166951420 is about 46550.5254535327. The cubic root of 2166951420 is about 1294.0460309769.

The spelling of 2166951420 in words is "two billion, one hundred sixty-six million, nine hundred fifty-one thousand, four hundred twenty".