2691215655 has 32 divisors (see below), whose sum is σ = 4364527104. Its totient is φ = 1415842176.

The previous prime is 2691215641. The next prime is 2691215663. The reversal of 2691215655 is 5565121962.

It is not a de Polignac number, because 2691215655 - 2⁵ = 2691215623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1103097 + ... + 1105533.

It is an arithmetic number, because the mean of its divisors is an integer number (136391472).

Almost surely, 2^2691215655 is an apocalyptic number.

2691215655 is a deficient number, since it is larger than the sum of its proper divisors (1673311449).

2691215655 is a wasteful number, since it uses less digits than its factorization.

2691215655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its digits is 162000, while the sum is 42.

The square root of 2691215655 is about 51876.9279641731. The cubic root of 2691215655 is about 1390.9648865322.

The spelling of 2691215655 in words is "two billion, six hundred ninety-one million, two hundred fifteen thousand, six hundred fifty-five".