2685521878 has 24 divisors (see below), whose sum is σ = 4502713536. Its totient is φ = 1199484000.

The previous prime is 2685521869. The next prime is 2685521879. The reversal of 2685521878 is 8781255862.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685521879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117673 + ... + 138628.

It is an arithmetic number, because the mean of its divisors is an integer number (187613064).

Almost surely, 2^2685521878 is an apocalyptic number.

2685521878 is a deficient number, since it is larger than the sum of its proper divisors (1817191658).

2685521878 is a wasteful number, since it uses less digits than its factorization.

2685521878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256360 (or 256347 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 52.

The square root of 2685521878 is about 51822.0211686113. The cubic root of 2685521878 is about 1389.9832439365.

The spelling of 2685521878 in words is "two billion, six hundred eighty-five million, five hundred twenty-one thousand, eight hundred seventy-eight".