2015867661 has 8 divisors (see below), whose sum is σ = 2688210144. Its totient is φ = 1343718480.

The previous prime is 2015867657. The next prime is 2015867669. The reversal of 2015867661 is 1667685102.

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

It is not a de Polignac number, because 2015867661 - 2² = 2015867657 is a prime.

It is a super-2 number, since 2×2015867661² = 8127444853331221842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015867669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21931 + ... + 67176.

It is an arithmetic number, because the mean of its divisors is an integer number (336026268).

Almost surely, 2^2015867661 is an apocalyptic number.

It is an amenable number.

2015867661 is a deficient number, since it is larger than the sum of its proper divisors (672342483).

2015867661 is an equidigital number, since it uses as much as digits as its factorization.

2015867661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96651.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 2015867661 is about 44898.4149052057. The cubic root of 2015867661 is about 1263.2442767071.

The spelling of 2015867661 in words is "two billion, fifteen million, eight hundred sixty-seven thousand, six hundred sixty-one".