6990979777940 has 24 divisors (see below), whose sum is σ = 14681127236832. Its totient is φ = 2796378634400.

The previous prime is 6990979777913. The next prime is 6990979777993. The reversal of 6990979777940 is 497779790996.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4244915 + ... + 5656965.

It is an arithmetic number, because the mean of its divisors is an integer number (611713634868).

Almost surely, 2^{6990979777940} is an apocalyptic number.

It is an amenable number.

6990979777940 is an abundant number, since it is smaller than the sum of its proper divisors (7690147458892).

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

6990979777940 is a wasteful number, since it uses less digits than its factorization.

6990979777940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659607 (or 1659605 counting only the distinct ones).

The product of its (nonzero) digits is 3402639576, while the sum is 83.

The spelling of 6990979777940 in words is "six trillion, nine hundred ninety billion, nine hundred seventy-nine million, seven hundred seventy-seven thousand, nine hundred forty".