661847020 has 12 divisors (see below), whose sum is σ = 1389878784. Its totient is φ = 264738800.

The previous prime is 661847003. The next prime is 661847023. The reversal of 661847020 is 20748166.

It is not an unprimeable number, because it can be changed into a prime (661847023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16546156 + ... + 16546195.

It is an arithmetic number, because the mean of its divisors is an integer number (115823232).

Almost surely, 2^661847020 is an apocalyptic number.

It is an amenable number.

661847020 is an abundant number, since it is smaller than the sum of its proper divisors (728031764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661847020 is a wasteful number, since it uses less digits than its factorization.

661847020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33092360 (or 33092358 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 661847020 is about 25726.3876204958. The cubic root of 661847020 is about 871.4701965758.

The spelling of 661847020 in words is "six hundred sixty-one million, eight hundred forty-seven thousand, twenty".