165021333755 has 4 divisors (see below), whose sum is σ = 198025600512. Its totient is φ = 132017067000.

The previous prime is 165021333689. The next prime is 165021333767. The reversal of 165021333755 is 557333120561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165021333755 - 2¹² = 165021329659 is a prime.

It is a Duffinian number.

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, 16502133371 + ... + 16502133380.

It is an arithmetic number, because the mean of its divisors is an integer number (49506400128).

Almost surely, 2^165021333755 is an apocalyptic number.

165021333755 is a deficient number, since it is larger than the sum of its proper divisors (33004266757).

165021333755 is an equidigital number, since it uses as much as digits as its factorization.

165021333755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33004266756.

The product of its (nonzero) digits is 283500, while the sum is 41.

The spelling of 165021333755 in words is "one hundred sixty-five billion, twenty-one million, three hundred thirty-three thousand, seven hundred fifty-five".