2015390661 has 8 divisors (see below), whose sum is σ = 2702721120. Its totient is φ = 1335826992.

The previous prime is 2015390633. The next prime is 2015390677. The reversal of 2015390661 is 1660935102.

It is a happy number.

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

It is not a de Polignac number, because 2015390661 - 2¹⁰ = 2015389637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015390161) 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, 1941091 + ... + 1942128.

It is an arithmetic number, because the mean of its divisors is an integer number (337840140).

Almost surely, 2^2015390661 is an apocalyptic number.

It is an amenable number.

2015390661 is a deficient number, since it is larger than the sum of its proper divisors (687330459).

2015390661 is a wasteful number, since it uses less digits than its factorization.

2015390661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883395.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 2015390661 is about 44893.1025993972. The cubic root of 2015390661 is about 1263.1446314336.

The spelling of 2015390661 in words is "two billion, fifteen million, three hundred ninety thousand, six hundred sixty-one".