990409765122 has 12 divisors (see below), whose sum is σ = 2145887824470. Its totient is φ = 330136588368.

The previous prime is 990409765109. The next prime is 990409765123. The reversal of 990409765122 is 221567904099.

It can be written as a sum of positive squares in only one way, i.e., 791599898961 + 198809866161 = 889719^2 + 445881^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (990409765123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27511382347 + ... + 27511382382.

Almost surely, 2^990409765122 is an apocalyptic number.

990409765122 is an abundant number, since it is smaller than the sum of its proper divisors (1155478059348).

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

990409765122 is a wasteful number, since it uses less digits than its factorization.

990409765122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55022764737 (or 55022764734 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 990409765122 in words is "nine hundred ninety billion, four hundred nine million, seven hundred sixty-five thousand, one hundred twenty-two".