2651615978 has 8 divisors (see below), whose sum is σ = 4339008000. Its totient is φ = 1205279980.

The previous prime is 2651615971. The next prime is 2651616007. The reversal of 2651615978 is 8795161562.

2651615978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2651615971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60263978 + ... + 60264021.

It is an arithmetic number, because the mean of its divisors is an integer number (542376000).

Almost surely, 2^2651615978 is an apocalyptic number.

2651615978 is a deficient number, since it is larger than the sum of its proper divisors (1687392022).

2651615978 is a wasteful number, since it uses less digits than its factorization.

2651615978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120528012.

The product of its digits is 907200, while the sum is 50.

The square root of 2651615978 is about 51493.8440786858. The cubic root of 2651615978 is about 1384.1087338836.

The spelling of 2651615978 in words is "two billion, six hundred fifty-one million, six hundred fifteen thousand, nine hundred seventy-eight".