2659961618 has 4 divisors (see below), whose sum is σ = 3989942430. Its totient is φ = 1329980808.

The previous prime is 2659961611. The next prime is 2659961641. The reversal of 2659961618 is 8161699562.

It is a happy number.

2659961618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 2618061889 + 41899729 = 51167^2 + 6473^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2659961618.

It is not an unprimeable number, because it can be changed into a prime (2659961611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664990403 + ... + 664990406.

Almost surely, 2^2659961618 is an apocalyptic number.

2659961618 is a deficient number, since it is larger than the sum of its proper divisors (1329980812).

2659961618 is a wasteful number, since it uses less digits than its factorization.

2659961618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329980811.

The product of its digits is 1399680, while the sum is 53.

The square root of 2659961618 is about 51574.8157340383. The cubic root of 2659961618 is about 1385.5593179440.

The spelling of 2659961618 in words is "two billion, six hundred fifty-nine million, nine hundred sixty-one thousand, six hundred eighteen".