165220330525456 has 20 divisors (see below), whose sum is σ = 321137120084572. Its totient is φ = 82346235019776.

The previous prime is 165220330525451. The next prime is 165220330525457. The reversal of 165220330525456 is 654525033022561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 77728626835456 + 87491703690000 = 8816384^2 + 9353700^2 .

It is not an unprimeable number, because it can be changed into a prime (165220330525451) 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 in 3 ways as a sum of consecutive naturals, for example, 16495635021 + ... + 16495645036.

Almost surely, 2^{165220330525456} is an apocalyptic number.

165220330525456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165220330525456 is a deficient number, since it is larger than the sum of its proper divisors (155916789559116).

165220330525456 is a wasteful number, since it uses less digits than its factorization.

165220330525456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32991280378 (or 32991280372 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 165220330525456 in words is "one hundred sixty-five trillion, two hundred twenty billion, three hundred thirty million, five hundred twenty-five thousand, four hundred fifty-six".