2661661662 has 16 divisors (see below), whose sum is σ = 5807261952. Its totient is φ = 806564120.

The previous prime is 2661661609. The next prime is 2661661669.

It is a happy number.

2661661662 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661661669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20164038 + ... + 20164169.

It is an arithmetic number, because the mean of its divisors is an integer number (362953872).

Almost surely, 2^2661661662 is an apocalyptic number.

2661661662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2661661662 is an abundant number, since it is smaller than the sum of its proper divisors (3145600290).

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

2661661662 is a wasteful number, since it uses less digits than its factorization.

2661661662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40328223.

The product of its digits is 186624, while the sum is 42.

The square root of 2661661662 is about 51591.2944400506. The cubic root of 2661661662 is about 1385.8544362577.

The spelling of 2661661662 in words is "two billion, six hundred sixty-one million, six hundred sixty-one thousand, six hundred sixty-two".