189661637470 has 32 divisors (see below), whose sum is σ = 361496520000. Its totient is φ = 71397336576.

The previous prime is 189661637467. The next prime is 189661637491. The reversal of 189661637470 is 74736166981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3639156 + ... + 3690904.

It is an arithmetic number, because the mean of its divisors is an integer number (11296766250).

Almost surely, 2^189661637470 is an apocalyptic number.

189661637470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189661637470 is a deficient number, since it is larger than the sum of its proper divisors (171834882530).

189661637470 is a wasteful number, since it uses less digits than its factorization.

189661637470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73332.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 189661637470 in words is "one hundred eighty-nine billion, six hundred sixty-one million, six hundred thirty-seven thousand, four hundred seventy".