6618091381 has 32 divisors (see below), whose sum is σ = 8066995200. Its totient is φ = 5351028480.

The previous prime is 6618091339. The next prime is 6618091391. The reversal of 6618091381 is 1831908166.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6618091381 - 2¹⁹ = 6617567093 is a prime.

It is a super-2 number, since 2×6618091381² = 87598267054532974322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618091331) 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 31 ways as a sum of consecutive naturals, for example, 1557646 + ... + 1561888.

It is an arithmetic number, because the mean of its divisors is an integer number (252093600).

Almost surely, 2^6618091381 is an apocalyptic number.

It is an amenable number.

6618091381 is a deficient number, since it is larger than the sum of its proper divisors (1448903819).

6618091381 is a wasteful number, since it uses less digits than its factorization.

6618091381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 6618091381 is about 81351.6526015299. The cubic root of 6618091381 is about 1877.4898010620.

The spelling of 6618091381 in words is "six billion, six hundred eighteen million, ninety-one thousand, three hundred eighty-one".