661202187 has 8 divisors (see below), whose sum is σ = 883133136. Its totient is φ = 440036352.

The previous prime is 661202177. The next prime is 661202207. The reversal of 661202187 is 781202166.

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

It is not a de Polignac number, because 661202187 - 2⁶ = 661202123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661202107) 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, 189258 + ... + 192719.

It is an arithmetic number, because the mean of its divisors is an integer number (110391642).

Almost surely, 2^661202187 is an apocalyptic number.

661202187 is a deficient number, since it is larger than the sum of its proper divisors (221930949).

661202187 is a wasteful number, since it uses less digits than its factorization.

661202187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382557.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 661202187 is about 25713.8520451526. The cubic root of 661202187 is about 871.1870821373.

The spelling of 661202187 in words is "six hundred sixty-one million, two hundred two thousand, one hundred eighty-seven".