661746836830 has 16 divisors (see below), whose sum is σ = 1191405204000. Its totient is φ = 264640757472.

The previous prime is 661746836827. The next prime is 661746836843. The reversal of 661746836830 is 38638647166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7199205 + ... + 7290544.

It is an arithmetic number, because the mean of its divisors is an integer number (74462825250).

Almost surely, 2^661746836830 is an apocalyptic number.

661746836830 is a deficient number, since it is larger than the sum of its proper divisors (529658367170).

661746836830 is a wasteful number, since it uses less digits than its factorization.

661746836830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494323.

The product of its (nonzero) digits is 20901888, while the sum is 58.

The spelling of 661746836830 in words is "six hundred sixty-one billion, seven hundred forty-six million, eight hundred thirty-six thousand, eight hundred thirty".