2477978865 has 16 divisors (see below), whose sum is σ = 4405296000. Its totient is φ = 1321588656.

The previous prime is 2477978857. The next prime is 2477978891. The reversal of 2477978865 is 5688797742.

It is not a de Polignac number, because 2477978865 - 2³ = 2477978857 is a prime.

It is a super-2 number, since 2×2477978865² = 12280758510773376450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9177565 + ... + 9177834.

It is an arithmetic number, because the mean of its divisors is an integer number (275331000).

Almost surely, 2^2477978865 is an apocalyptic number.

It is an amenable number.

2477978865 is a deficient number, since it is larger than the sum of its proper divisors (1927317135).

2477978865 is a wasteful number, since it uses less digits than its factorization.

2477978865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18355413 (or 18355407 counting only the distinct ones).

The product of its digits is 47416320, while the sum is 63.

The square root of 2477978865 is about 49779.3015720390. The cubic root of 2477978865 is about 1353.2120797734.

The spelling of 2477978865 in words is "two billion, four hundred seventy-seven million, nine hundred seventy-eight thousand, eight hundred sixty-five".