661599527 has 4 divisors (see below), whose sum is σ = 662601096. Its totient is φ = 660597960.

The previous prime is 661599467. The next prime is 661599529. The reversal of 661599527 is 725995166.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 661599527 - 2⁸ = 661599271 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 (661599529) 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, 499793 + ... + 501114.

It is an arithmetic number, because the mean of its divisors is an integer number (165650274).

Almost surely, 2^661599527 is an apocalyptic number.

661599527 is a deficient number, since it is larger than the sum of its proper divisors (1001569).

661599527 is a wasteful number, since it uses less digits than its factorization.

661599527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001568.

The product of its digits is 1020600, while the sum is 50.

The square root of 661599527 is about 25721.5770706230. The cubic root of 661599527 is about 871.3615563328.

The spelling of 661599527 in words is "six hundred sixty-one million, five hundred ninety-nine thousand, five hundred twenty-seven".