661834371 has 16 divisors (see below), whose sum is σ = 985057920. Its totient is φ = 391782720.

The previous prime is 661834357. The next prime is 661834409. The reversal of 661834371 is 173438166.

661834371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661834371 - 2⁵ = 661834339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661834301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231786 + ... + 234623.

It is an arithmetic number, because the mean of its divisors is an integer number (61566120).

Almost surely, 2^661834371 is an apocalyptic number.

661834371 is a deficient number, since it is larger than the sum of its proper divisors (323223549).

661834371 is a wasteful number, since it uses less digits than its factorization.

661834371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466466.

The product of its digits is 72576, while the sum is 39.

The square root of 661834371 is about 25726.1417822417. The cubic root of 661834371 is about 871.4646447910.

The spelling of 661834371 in words is "six hundred sixty-one million, eight hundred thirty-four thousand, three hundred seventy-one".