661027071 has 8 divisors (see below), whose sum is σ = 881495424. Its totient is φ = 440621720.

The previous prime is 661027063. The next prime is 661027097. The reversal of 661027071 is 170720166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661027071 - 2³ = 661027063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661027021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20956 + ... + 41966.

It is an arithmetic number, because the mean of its divisors is an integer number (110186928).

Almost surely, 2^661027071 is an apocalyptic number.

661027071 is a deficient number, since it is larger than the sum of its proper divisors (220468353).

661027071 is a wasteful number, since it uses less digits than its factorization.

661027071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31501.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 661027071 is about 25710.4467289077. The cubic root of 661027071 is about 871.1101655399.

The spelling of 661027071 in words is "six hundred sixty-one million, twenty-seven thousand, seventy-one".