2618640891 has 12 divisors (see below), whose sum is σ = 3783939432. Its totient is φ = 1745087616.

The previous prime is 2618640847. The next prime is 2618641027. The reversal of 2618640891 is 1980468162.

It is not a de Polignac number, because 2618640891 - 2¹⁴ = 2618624507 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2618640841) 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 11 ways as a sum of consecutive naturals, for example, 30841 + ... + 78666.

It is an arithmetic number, because the mean of its divisors is an integer number (315328286).

Almost surely, 2^2618640891 is an apocalyptic number.

2618640891 is a deficient number, since it is larger than the sum of its proper divisors (1165298541).

2618640891 is a wasteful number, since it uses less digits than its factorization.

2618640891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112170 (or 112167 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 2618640891 is about 51172.6576503507. The cubic root of 2618640891 is about 1378.3472636964.

The spelling of 2618640891 in words is "two billion, six hundred eighteen million, six hundred forty thousand, eight hundred ninety-one".