2758378665 has 16 divisors (see below), whose sum is σ = 5043892608. Its totient is φ = 1260973056.

The previous prime is 2758378633. The next prime is 2758378681. The reversal of 2758378665 is 5668738572.

It is not a de Polignac number, because 2758378665 - 2⁵ = 2758378633 is a prime.

It is a super-3 number, since 3×2758378665³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13135032 + ... + 13135241.

It is an arithmetic number, because the mean of its divisors is an integer number (315243288).

Almost surely, 2^2758378665 is an apocalyptic number.

It is an amenable number.

2758378665 is a deficient number, since it is larger than the sum of its proper divisors (2285513943).

2758378665 is a wasteful number, since it uses less digits than its factorization.

2758378665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26270288.

The product of its digits is 16934400, while the sum is 57.

The square root of 2758378665 is about 52520.2690872772. The cubic root of 2758378665 is about 1402.4410923368.

The spelling of 2758378665 in words is "two billion, seven hundred fifty-eight million, three hundred seventy-eight thousand, six hundred sixty-five".