615666041 has 4 divisors (see below), whose sum is σ = 619352832. Its totient is φ = 611979252.

The previous prime is 615666011. The next prime is 615666049. The reversal of 615666041 is 140666516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-615666041 is a prime.

It is a super-2 number, since 2×615666041² = 758089348081227362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 615665992 and 615666010.

It is not an unprimeable number, because it can be changed into a prime (615666049) 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, 1843145 + ... + 1843478.

It is an arithmetic number, because the mean of its divisors is an integer number (154838208).

Almost surely, 2^615666041 is an apocalyptic number.

It is an amenable number.

615666041 is a deficient number, since it is larger than the sum of its proper divisors (3686791).

615666041 is a wasteful number, since it uses less digits than its factorization.

615666041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686790.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 615666041 is about 24812.6185840995. The cubic root of 615666041 is about 850.7103823767.

The spelling of 615666041 in words is "six hundred fifteen million, six hundred sixty-six thousand, forty-one".