165189721946 has 8 divisors (see below), whose sum is σ = 251482860480. Its totient is φ = 81362101788.

The previous prime is 165189721937. The next prime is 165189722029. The reversal of 165189721946 is 649127981561.

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, 616379426 + ... + 616379693.

It is an arithmetic number, because the mean of its divisors is an integer number (31435357560).

Almost surely, 2^165189721946 is an apocalyptic number.

165189721946 is a deficient number, since it is larger than the sum of its proper divisors (86293138534).

165189721946 is a wasteful number, since it uses less digits than its factorization.

165189721946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232759188.

The product of its digits is 6531840, while the sum is 59.

The spelling of 165189721946 in words is "one hundred sixty-five billion, one hundred eighty-nine million, seven hundred twenty-one thousand, nine hundred forty-six".