661710527 has 4 divisors (see below), whose sum is σ = 661865616. Its totient is φ = 661555440.

The previous prime is 661710503. The next prime is 661710541. The reversal of 661710527 is 725017166.

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 661710527 - 2⁶ = 661710463 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 (661713527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70958 + ... + 79739.

It is an arithmetic number, because the mean of its divisors is an integer number (165466404).

Almost surely, 2^661710527 is an apocalyptic number.

661710527 is a deficient number, since it is larger than the sum of its proper divisors (155089).

661710527 is a wasteful number, since it uses less digits than its factorization.

661710527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155088.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 661710527 is about 25723.7347016330. The cubic root of 661710527 is about 871.4102845640.

The spelling of 661710527 in words is "six hundred sixty-one million, seven hundred ten thousand, five hundred twenty-seven".