6115867661 has 4 divisors (see below), whose sum is σ = 6122763552. Its totient is φ = 6108971772.

The previous prime is 6115867631. The next prime is 6115867663. The reversal of 6115867661 is 1667685116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6115867661 is a prime.

It is a super-2 number, since 2×6115867661² = 74807674493731221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6115867663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446615 + ... + 3448388.

It is an arithmetic number, because the mean of its divisors is an integer number (1530690888).

Almost surely, 2^6115867661 is an apocalyptic number.

It is an amenable number.

6115867661 is a deficient number, since it is larger than the sum of its proper divisors (6895891).

6115867661 is an equidigital number, since it uses as much as digits as its factorization.

6115867661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895890.

The product of its digits is 362880, while the sum is 47.

The square root of 6115867661 is about 78204.0130747777. The cubic root of 6115867661 is about 1828.7430688153.

The spelling of 6115867661 in words is "six billion, one hundred fifteen million, eight hundred sixty-seven thousand, six hundred sixty-one".