2640634442340 has 24 divisors (see below), whose sum is σ = 7393776438720. Its totient is φ = 704169184608.

The previous prime is 2640634442339. The next prime is 2640634442357. The reversal of 2640634442340 is 432444360462.

It is a junction number, because it is equal to n+sod(n) for n = 2640634442292 and 2640634442301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22005286960 + ... + 22005287079.

It is an arithmetic number, because the mean of its divisors is an integer number (308074018280).

Almost surely, 2^{2640634442340} is an apocalyptic number.

2640634442340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640634442340 is an abundant number, since it is smaller than the sum of its proper divisors (4753141996380).

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

2640634442340 is a wasteful number, since it uses less digits than its factorization.

2640634442340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44010574051 (or 44010574049 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 42.

The spelling of 2640634442340 in words is "two trillion, six hundred forty billion, six hundred thirty-four million, four hundred forty-two thousand, three hundred forty".