661672339 has 8 divisors (see below), whose sum is σ = 683504640. Its totient is φ = 639870600.

The previous prime is 661672313. The next prime is 661672367. The reversal of 661672339 is 933276166.

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 661672339 - 2¹³ = 661664147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661672295 and 661672304.

It is not an unprimeable number, because it can be changed into a prime (661676339) 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, 41484 + ... + 55174.

It is an arithmetic number, because the mean of its divisors is an integer number (85438080).

Almost surely, 2^661672339 is an apocalyptic number.

661672339 is a deficient number, since it is larger than the sum of its proper divisors (21832301).

661672339 is a wasteful number, since it uses less digits than its factorization.

661672339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15281.

The product of its digits is 244944, while the sum is 43.

The square root of 661672339 is about 25722.9924192346. The cubic root of 661672339 is about 871.3935209114.

The spelling of 661672339 in words is "six hundred sixty-one million, six hundred seventy-two thousand, three hundred thirty-nine".