661203027 has 16 divisors (see below), whose sum is σ = 979956000. Its totient is φ = 440623872.

The previous prime is 661203019. The next prime is 661203043. The reversal of 661203027 is 720302166.

It is a happy number.

It is not a de Polignac number, because 661203027 - 2³ = 661203019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (661203077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129499 + ... + 134507.

It is an arithmetic number, because the mean of its divisors is an integer number (61247250).

Almost surely, 2^661203027 is an apocalyptic number.

661203027 is a deficient number, since it is larger than the sum of its proper divisors (318752973).

661203027 is a wasteful number, since it uses less digits than its factorization.

661203027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907 (or 9901 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 661203027 is about 25713.8683787562. The cubic root of 661203027 is about 871.1874510597.

The spelling of 661203027 in words is "six hundred sixty-one million, two hundred three thousand, twenty-seven".