2166520494 has 32 divisors (see below), whose sum is σ = 4618749600. Its totient is φ = 675126272.

The previous prime is 2166520493. The next prime is 2166520501. The reversal of 2166520494 is 4940256612.

It is a happy number.

It is a super-2 number, since 2×2166520494² = 9387622101844008072, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166520493) 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, 56079 + ... + 86474.

It is an arithmetic number, because the mean of its divisors is an integer number (144335925).

Almost surely, 2^2166520494 is an apocalyptic number.

2166520494 is an abundant number, since it is smaller than the sum of its proper divisors (2452229106).

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

2166520494 is a wasteful number, since it uses less digits than its factorization.

2166520494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142724.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 2166520494 is about 46545.8966397684. The cubic root of 2166520494 is about 1293.9602460898.

The spelling of 2166520494 in words is "two billion, one hundred sixty-six million, five hundred twenty thousand, four hundred ninety-four".