990645862567 has 8 divisors (see below), whose sum is σ = 998317655280. Its totient is φ = 982975730880.

The previous prime is 990645862559. The next prime is 990645862579. The reversal of 990645862567 is 765268546099.

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

It is a cyclic number.

It is not a de Polignac number, because 990645862567 - 2³ = 990645862559 is a prime.

It is a super-2 number, since 2×990645862567² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990645865567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795793 + ... + 1616965.

It is an arithmetic number, because the mean of its divisors is an integer number (124789706910).

Almost surely, 2^990645862567 is an apocalyptic number.

990645862567 is a deficient number, since it is larger than the sum of its proper divisors (7671792713).

990645862567 is a wasteful number, since it uses less digits than its factorization.

990645862567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830513.

The product of its (nonzero) digits is 195955200, while the sum is 67.

The spelling of 990645862567 in words is "nine hundred ninety billion, six hundred forty-five million, eight hundred sixty-two thousand, five hundred sixty-seven".