2661665622 has 64 divisors (see below), whose sum is σ = 7027305984. Its totient is φ = 650672640.

The previous prime is 2661665609. The next prime is 2661665641. The reversal of 2661665622 is 2265661662.

It is a super-3 number, since 3×2661665622³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161593 + ... + 177300.

It is an arithmetic number, because the mean of its divisors is an integer number (109801656).

Almost surely, 2^2661665622 is an apocalyptic number.

2661665622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2661665622 is an abundant number, since it is smaller than the sum of its proper divisors (4365640362).

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

2661665622 is a wasteful number, since it uses less digits than its factorization.

2661665622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338933.

The product of its digits is 311040, while the sum is 42.

The square root of 2661665622 is about 51591.3328186043. The cubic root of 2661665622 is about 1385.8551235453.

The spelling of 2661665622 in words is "two billion, six hundred sixty-one million, six hundred sixty-five thousand, six hundred twenty-two".