615275844064661 has 4 divisors (see below), whose sum is σ = 662604755146572. Its totient is φ = 567946932982752.

The previous prime is 615275844064639. The next prime is 615275844064733. The reversal of 615275844064661 is 166460448572516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 403043567643025 + 212232276421636 = 20075945^2 + 14568194^2 .

It is a cyclic number.

It is not a de Polignac number, because 615275844064661 - 2³⁴ = 615258664195477 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 (615275844064361) 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, 23664455540936 + ... + 23664455540961.

It is an arithmetic number, because the mean of its divisors is an integer number (165651188786643).

Almost surely, 2^{615275844064661} is an apocalyptic number.

It is an amenable number.

615275844064661 is a deficient number, since it is larger than the sum of its proper divisors (47328911081911).

615275844064661 is a wasteful number, since it uses less digits than its factorization.

615275844064661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47328911081910.

The product of its (nonzero) digits is 232243200, while the sum is 65.

The spelling of 615275844064661 in words is "six hundred fifteen trillion, two hundred seventy-five billion, eight hundred forty-four million, sixty-four thousand, six hundred sixty-one".