661470889 has 12 divisors (see below), whose sum is σ = 696730320. Its totient is φ = 627789680.

The previous prime is 661470881. The next prime is 661470893. The reversal of 661470889 is 988074166.

It is not a de Polignac number, because 661470889 - 2³ = 661470881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661470881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42954 + ... + 56284.

It is an arithmetic number, because the mean of its divisors is an integer number (58060860).

Almost surely, 2^661470889 is an apocalyptic number.

It is an amenable number.

661470889 is a deficient number, since it is larger than the sum of its proper divisors (35259431).

661470889 is a wasteful number, since it uses less digits than its factorization.

661470889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13448 (or 13419 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 661470889 is about 25719.0763636644. The cubic root of 661470889 is about 871.3050783231.

The spelling of 661470889 in words is "six hundred sixty-one million, four hundred seventy thousand, eight hundred eighty-nine".