165091521404 has 6 divisors (see below), whose sum is σ = 288910162464. Its totient is φ = 82545760700.

The previous prime is 165091521403. The next prime is 165091521563. The reversal of 165091521404 is 404125190561.

165091521404 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165091521403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20636440172 + ... + 20636440179.

It is an arithmetic number, because the mean of its divisors is an integer number (48151693744).

Almost surely, 2^165091521404 is an apocalyptic number.

It is an amenable number.

165091521404 is a deficient number, since it is larger than the sum of its proper divisors (123818641060).

165091521404 is a wasteful number, since it uses less digits than its factorization.

165091521404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41272880355 (or 41272880353 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 165091521404 in words is "one hundred sixty-five billion, ninety-one million, five hundred twenty-one thousand, four hundred four".