2661078878 has 4 divisors (see below), whose sum is σ = 3991618320. Its totient is φ = 1330539438.

The previous prime is 2661078869. The next prime is 2661078899. The reversal of 2661078878 is 8788701662.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665269718 + ... + 665269721.

It is an arithmetic number, because the mean of its divisors is an integer number (997904580).

Almost surely, 2^2661078878 is an apocalyptic number.

2661078878 is a deficient number, since it is larger than the sum of its proper divisors (1330539442).

2661078878 is a wasteful number, since it uses less digits than its factorization.

2661078878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330539441.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The square root of 2661078878 is about 51585.6460461629. The cubic root of 2661078878 is about 1385.7532823110.

The spelling of 2661078878 in words is "two billion, six hundred sixty-one million, seventy-eight thousand, eight hundred seventy-eight".