661138834 has 8 divisors (see below), whose sum is σ = 1004261760. Its totient is φ = 326384916.

The previous prime is 661138787. The next prime is 661138859. The reversal of 661138834 is 438831166.

It is a happy number.

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, 2092054 + ... + 2092369.

It is an arithmetic number, because the mean of its divisors is an integer number (125532720).

Almost surely, 2^661138834 is an apocalyptic number.

661138834 is a deficient number, since it is larger than the sum of its proper divisors (343122926).

661138834 is a wasteful number, since it uses less digits than its factorization.

661138834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184504.

The product of its digits is 82944, while the sum is 40.

The square root of 661138834 is about 25712.6201309785. The cubic root of 661138834 is about 871.1592570236.

It can be divided in two parts, 66113 and 8834, that added together give a palindrome (74947).

The spelling of 661138834 in words is "six hundred sixty-one million, one hundred thirty-eight thousand, eight hundred thirty-four".