661473671 has 8 divisors (see below), whose sum is σ = 663957504. Its totient is φ = 658995480.

The previous prime is 661473661. The next prime is 661473677. The reversal of 661473671 is 176374166.

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 661473671 - 2²² = 657279367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661473677) 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, 497810 + ... + 499136.

It is an arithmetic number, because the mean of its divisors is an integer number (82994688).

Almost surely, 2^661473671 is an apocalyptic number.

661473671 is a deficient number, since it is larger than the sum of its proper divisors (2483833).

661473671 is a wasteful number, since it uses less digits than its factorization.

661473671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821.

The product of its digits is 127008, while the sum is 41.

The square root of 661473671 is about 25719.1304479759. The cubic root of 661473671 is about 871.3062998268.

The spelling of 661473671 in words is "six hundred sixty-one million, four hundred seventy-three thousand, six hundred seventy-one".