615663 has 12 divisors (see below), whose sum is σ = 903448. Its totient is φ = 403920.

The previous prime is 615661. The next prime is 615677. The reversal of 615663 is 366516.

It is not a de Polignac number, because 615663 - 2¹ = 615661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93 + ... + 1113.

2⁶¹⁵⁶⁶³ is an apocalyptic number.

615663 is a deficient number, since it is larger than the sum of its proper divisors (287785).

615663 is a wasteful number, since it uses less digits than its factorization.

615663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094 (or 1091 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 615663 is about 784.6419565636. The cubic root of 615663 is about 85.0708981718.

The spelling of 615663 in words is "six hundred fifteen thousand, six hundred sixty-three".