661479389 has 8 divisors (see below), whose sum is σ = 664744032. Its totient is φ = 658221840.

The previous prime is 661479359. The next prime is 661479419. The reversal of 661479389 is 983974166.

It is an interprime number because it is at equal distance from previous prime (661479359) and next prime (661479419).

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 661479389 - 2¹² = 661475293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661479389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661479349) 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, 299162 + ... + 301364.

It is an arithmetic number, because the mean of its divisors is an integer number (83093004).

Almost surely, 2^661479389 is an apocalyptic number.

It is an amenable number.

661479389 is a deficient number, since it is larger than the sum of its proper divisors (3264643).

661479389 is a wasteful number, since it uses less digits than its factorization.

661479389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547.

The product of its digits is 1959552, while the sum is 53.

The square root of 661479389 is about 25719.2416101253. The cubic root of 661479389 is about 871.3088104407.

The spelling of 661479389 in words is "six hundred sixty-one million, four hundred seventy-nine thousand, three hundred eighty-nine".