615364661 has 4 divisors (see below), whose sum is σ = 615422892. Its totient is φ = 615306432.

The previous prime is 615364643. The next prime is 615364693. The reversal of 615364661 is 166463516.

615364661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 455822500 + 159542161 = 21350^2 + 12631^2 .

It is a cyclic number.

It is not a de Polignac number, because 615364661 - 2¹⁴ = 615348277 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 (615364621) 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, 8306 + ... + 36051.

It is an arithmetic number, because the mean of its divisors is an integer number (153855723).

Almost surely, 2^615364661 is an apocalyptic number.

It is an amenable number.

615364661 is a deficient number, since it is larger than the sum of its proper divisors (58231).

615364661 is a wasteful number, since it uses less digits than its factorization.

615364661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58230.

The product of its digits is 77760, while the sum is 38.

The square root of 615364661 is about 24806.5447211013. The cubic root of 615364661 is about 850.5715468584.

The spelling of 615364661 in words is "six hundred fifteen million, three hundred sixty-four thousand, six hundred sixty-one".