2651855678 has 4 divisors (see below), whose sum is σ = 3977783520. Its totient is φ = 1325927838.

The previous prime is 2651855677. The next prime is 2651855681. The reversal of 2651855678 is 8765581562.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2651855677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 662963918 + ... + 662963921.

It is an arithmetic number, because the mean of its divisors is an integer number (994445880).

Almost surely, 2^2651855678 is an apocalyptic number.

2651855678 is a deficient number, since it is larger than the sum of its proper divisors (1325927842).

2651855678 is a wasteful number, since it uses less digits than its factorization.

2651855678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325927841.

The product of its digits is 4032000, while the sum is 53.

The square root of 2651855678 is about 51496.1714887622. The cubic root of 2651855678 is about 1384.1504393781.

The spelling of 2651855678 in words is "two billion, six hundred fifty-one million, eight hundred fifty-five thousand, six hundred seventy-eight".