661673347 has 8 divisors (see below), whose sum is σ = 697064400. Its totient is φ = 626338944.

The previous prime is 661673333. The next prime is 661673351. The reversal of 661673347 is 743376166.

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 661673347 - 2⁷ = 661673219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661673317) 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, 10983 + ... + 37999.

It is an arithmetic number, because the mean of its divisors is an integer number (87133050).

Almost surely, 2^661673347 is an apocalyptic number.

661673347 is a deficient number, since it is larger than the sum of its proper divisors (35391053).

661673347 is a wasteful number, since it uses less digits than its factorization.

661673347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28325.

The product of its digits is 381024, while the sum is 43.

The square root of 661673347 is about 25723.0120125929. The cubic root of 661673347 is about 871.3939634085.

The spelling of 661673347 in words is "six hundred sixty-one million, six hundred seventy-three thousand, three hundred forty-seven".