990644066402 has 8 divisors (see below), whose sum is σ = 1485975375696. Its totient is φ = 495318941172.

The previous prime is 990644066389. The next prime is 990644066407. The reversal of 990644066402 is 204660446099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (990644066407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122308 + ... + 1800239.

It is an arithmetic number, because the mean of its divisors is an integer number (185746921962).

Almost surely, 2^990644066402 is an apocalyptic number.

990644066402 is a deficient number, since it is larger than the sum of its proper divisors (495331309294).

990644066402 is a wasteful number, since it uses less digits than its factorization.

990644066402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092032.

The product of its (nonzero) digits is 2239488, while the sum is 50.

The spelling of 990644066402 in words is "nine hundred ninety billion, six hundred forty-four million, sixty-six thousand, four hundred two".