165221132240604 has 24 divisors (see below), whose sum is σ = 420562882067328. Its totient is φ = 50067009769840.

The previous prime is 165221132240539. The next prime is 165221132240609. The reversal of 165221132240604 is 406042231122561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221132240609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625837621992 + ... + 625837622255.

It is an arithmetic number, because the mean of its divisors is an integer number (17523453419472).

Almost surely, 2^{165221132240604} is an apocalyptic number.

It is an amenable number.

165221132240604 is an abundant number, since it is smaller than the sum of its proper divisors (255341749826724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165221132240604 is a wasteful number, since it uses less digits than its factorization.

165221132240604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251675244265 (or 1251675244263 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 165221132240604 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred forty thousand, six hundred four".