990620655201 has 12 divisors (see below), whose sum is σ = 1432200888612. Its totient is φ = 659811745536.

The previous prime is 990620655181. The next prime is 990620655203. The reversal of 990620655201 is 102556026099.

It is a happy number.

990620655201 is a `hidden beast` number, since 9 + 9 + 0 + 62 + 0 + 65 + 520 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 166476240225 + 824144414976 = 408015^2 + 907824^2 .

It is a de Polignac number, because none of the positive numbers 2^k-990620655201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990620655203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50158296 + ... + 50178041.

It is an arithmetic number, because the mean of its divisors is an integer number (119350074051).

Almost surely, 2^990620655201 is an apocalyptic number.

It is an amenable number.

990620655201 is a deficient number, since it is larger than the sum of its proper divisors (441580233411).

990620655201 is a wasteful number, since it uses less digits than its factorization.

990620655201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100337440 (or 100337437 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 990620655201 in words is "nine hundred ninety billion, six hundred twenty million, six hundred fifty-five thousand, two hundred one".