2166621000345 has 64 divisors (see below), whose sum is σ = 3864712642560. Its totient is φ = 1151654970816.

The previous prime is 2166621000317. The next prime is 2166621000413. The reversal of 2166621000345 is 5430001266612.

It is not a de Polignac number, because 2166621000345 - 2²¹ = 2166618903193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50431944 + ... + 50474886.

It is an arithmetic number, because the mean of its divisors is an integer number (60386135040).

Almost surely, 2^{2166621000345} is an apocalyptic number.

It is an amenable number.

2166621000345 is a deficient number, since it is larger than the sum of its proper divisors (1698091642215).

2166621000345 is a wasteful number, since it uses less digits than its factorization.

2166621000345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44203 (or 44197 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 2166621000345 its reverse (5430001266612), we get a palindrome (7596622266957).

The spelling of 2166621000345 in words is "two trillion, one hundred sixty-six billion, six hundred twenty-one million, three hundred forty-five", and thus it is an aban number.