7758778857966 has 12 divisors (see below), whose sum is σ = 16810687525632. Its totient is φ = 2586259619316.

The previous prime is 7758778857959. The next prime is 7758778857997. The reversal of 7758778857966 is 6697588778577.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215521634926 + ... + 215521634961.

It is an arithmetic number, because the mean of its divisors is an integer number (1400890627136).

Almost surely, 2^{7758778857966} is an apocalyptic number.

7758778857966 is an abundant number, since it is smaller than the sum of its proper divisors (9051908667666).

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

7758778857966 is a wasteful number, since it uses less digits than its factorization.

7758778857966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431043269895 (or 431043269892 counting only the distinct ones).

The product of its digits is 69701990400, while the sum is 90.

The spelling of 7758778857966 in words is "seven trillion, seven hundred fifty-eight billion, seven hundred seventy-eight million, eight hundred fifty-seven thousand, nine hundred sixty-six".