2161490645952 has 168 divisors, whose sum is σ = 6844307408640. Its totient is φ = 646705912320.

The previous prime is 2161490645921. The next prime is 2161490645957. The reversal of 2161490645952 is 2595460941612.

It is a happy number.

2161490645952 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 49 + 0 + 6 + 4 + 595 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161490645957) 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, 1658598 + ... + 2659685.

Almost surely, 2^{2161490645952} is an apocalyptic number.

2161490645952 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2161490645952 is an abundant number, since it is smaller than the sum of its proper divisors (4682816762688).

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

2161490645952 is a wasteful number, since it uses less digits than its factorization.

2161490645952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318391 (or 4318378 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 2161490645952 in words is "two trillion, one hundred sixty-one billion, four hundred ninety million, six hundred forty-five thousand, nine hundred fifty-two".