2640361881 has 16 divisors (see below), whose sum is σ = 3584298368. Its totient is φ = 1728432000.

The previous prime is 2640361879. The next prime is 2640361901. The reversal of 2640361881 is 1881630462.

2640361881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2640361881 - 2¹ = 2640361879 is a prime.

It is a super-2 number, since 2×2640361881² = 13943021725275716322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640363881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97980 + ... + 121986.

It is an arithmetic number, because the mean of its divisors is an integer number (224018648).

Almost surely, 2^2640361881 is an apocalyptic number.

It is an amenable number.

2640361881 is a deficient number, since it is larger than the sum of its proper divisors (943936487).

2640361881 is a wasteful number, since it uses less digits than its factorization.

2640361881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24672.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 2640361881 is about 51384.4517436938. The cubic root of 2640361881 is about 1382.1477933915.

The spelling of 2640361881 in words is "two billion, six hundred forty million, three hundred sixty-one thousand, eight hundred eighty-one".