6685977942 has 24 divisors (see below), whose sum is σ = 16555755216. Its totient is φ = 1910279376.

The previous prime is 6685977911. The next prime is 6685977971. The reversal of 6685977942 is 2497795866.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 6685977942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26531533 + ... + 26531784.

It is an arithmetic number, because the mean of its divisors is an integer number (689823134).

Almost surely, 2^6685977942 is an apocalyptic number.

6685977942 is an abundant number, since it is smaller than the sum of its proper divisors (9869777274).

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

6685977942 is a wasteful number, since it uses less digits than its factorization.

6685977942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53063332 (or 53063329 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 63.

The square root of 6685977942 is about 81767.8295052522. The cubic root of 6685977942 is about 1883.8875664846.

The spelling of 6685977942 in words is "six billion, six hundred eighty-five million, nine hundred seventy-seven thousand, nine hundred forty-two".