661834845 has 48 divisors (see below), whose sum is σ = 1316070912. Its totient is φ = 301397760.

The previous prime is 661834829. The next prime is 661834907. The reversal of 661834845 is 548438166.

It is not a de Polignac number, because 661834845 - 2⁴ = 661834829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 661834845.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81489 + ... + 89241.

It is an arithmetic number, because the mean of its divisors is an integer number (27418144).

Almost surely, 2^661834845 is an apocalyptic number.

It is an amenable number.

661834845 is a deficient number, since it is larger than the sum of its proper divisors (654236067).

661834845 is a wasteful number, since it uses less digits than its factorization.

661834845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8042 (or 8039 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 661834845 is about 25726.1509946591. The cubic root of 661834845 is about 871.4648528361.

The spelling of 661834845 in words is "six hundred sixty-one million, eight hundred thirty-four thousand, eight hundred forty-five".