661275201 has 8 divisors (see below), whose sum is σ = 882889920. Its totient is φ = 440255312.

The previous prime is 661275187. The next prime is 661275227. The reversal of 661275201 is 102572166.

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 661275201 - 2⁵ = 661275169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661271201) 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, 146106 + ... + 150563.

It is an arithmetic number, because the mean of its divisors is an integer number (110361240).

Almost surely, 2^661275201 is an apocalyptic number.

It is an amenable number.

661275201 is a deficient number, since it is larger than the sum of its proper divisors (221614719).

661275201 is a wasteful number, since it uses less digits than its factorization.

661275201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297415.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 661275201 is about 25715.2717465711. The cubic root of 661275201 is about 871.2191482303.

The spelling of 661275201 in words is "six hundred sixty-one million, two hundred seventy-five thousand, two hundred one".