2640299218 has 4 divisors (see below), whose sum is σ = 3960448830. Its totient is φ = 1320149608.

The previous prime is 2640299197. The next prime is 2640299227. The reversal of 2640299218 is 8129920462.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1994783569 + 645515649 = 44663^2 + 25407^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660074803 + ... + 660074806.

Almost surely, 2^2640299218 is an apocalyptic number.

2640299218 is a deficient number, since it is larger than the sum of its proper divisors (1320149612).

2640299218 is a wasteful number, since it uses less digits than its factorization.

2640299218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320149611.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 2640299218 is about 51383.8419933738. The cubic root of 2640299218 is about 1382.1368592574.

The spelling of 2640299218 in words is "two billion, six hundred forty million, two hundred ninety-nine thousand, two hundred eighteen".