661415602 has 8 divisors (see below), whose sum is σ = 992368512. Its totient is φ = 330626100.

The previous prime is 661415591. The next prime is 661415621. The reversal of 661415602 is 206514166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30174 + ... + 47257.

It is an arithmetic number, because the mean of its divisors is an integer number (124046064).

Almost surely, 2^661415602 is an apocalyptic number.

661415602 is a deficient number, since it is larger than the sum of its proper divisors (330952910).

661415602 is a wasteful number, since it uses less digits than its factorization.

661415602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81704.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 661415602 is about 25718.0015164476. The cubic root of 661415602 is about 871.2808025327.

Adding to 661415602 its reverse (206514166), we get a palindrome (867929768).

The spelling of 661415602 in words is "six hundred sixty-one million, four hundred fifteen thousand, six hundred two".