2661912840 has 32 divisors (see below), whose sum is σ = 7985738880. Its totient is φ = 709843392.

The previous prime is 2661912839. The next prime is 2661912857. The reversal of 2661912840 is 482191662.

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 7 ways as a sum of consecutive naturals, for example, 11091184 + ... + 11091423.

It is an arithmetic number, because the mean of its divisors is an integer number (249554340).

Almost surely, 2^2661912840 is an apocalyptic number.

2661912840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661912840 is an abundant number, since it is smaller than the sum of its proper divisors (5323826040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2661912840 is a wasteful number, since it uses less digits than its factorization.

2661912840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22182621 (or 22182617 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 2661912840 is about 51593.7286886691. The cubic root of 2661912840 is about 1385.8980287250.

The spelling of 2661912840 in words is "two billion, six hundred sixty-one million, nine hundred twelve thousand, eight hundred forty".