2655691638 has 8 divisors (see below), whose sum is σ = 5311383288. Its totient is φ = 885230544.

The previous prime is 2655691631. The next prime is 2655691651. The reversal of 2655691638 is 8361965562.

It is a sphenic number, since it is the product of 3 distinct primes.

2655691638 is an admirable number.

It is a super-2 number, since 2×2655691638² = 14105396152286246088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2655691631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221307631 + ... + 221307642.

It is an arithmetic number, because the mean of its divisors is an integer number (663922911).

Almost surely, 2^2655691638 is an apocalyptic number.

2655691638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2655691638 is a wasteful number, since it uses less digits than its factorization.

2655691638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442615278.

The product of its digits is 2332800, while the sum is 51.

The square root of 2655691638 is about 51533.4031284564. The cubic root of 2655691638 is about 1384.8175178695.

The spelling of 2655691638 in words is "two billion, six hundred fifty-five million, six hundred ninety-one thousand, six hundred thirty-eight".