661245027 has 4 divisors (see below), whose sum is σ = 881660040. Its totient is φ = 440830016.

The previous prime is 661244873. The next prime is 661245047. The reversal of 661245027 is 720542166.

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 661245027 - 2²³ = 652856419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661245047) 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, 110207502 + ... + 110207507.

It is an arithmetic number, because the mean of its divisors is an integer number (220415010).

Almost surely, 2^661245027 is an apocalyptic number.

661245027 is a deficient number, since it is larger than the sum of its proper divisors (220415013).

661245027 is a wasteful number, since it uses less digits than its factorization.

661245027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220415012.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 661245027 is about 25714.6850457088. The cubic root of 661245027 is about 871.2058967799.

The spelling of 661245027 in words is "six hundred sixty-one million, two hundred forty-five thousand, twenty-seven".