165221400536144 has 40 divisors (see below), whose sum is σ = 324079831438272. Its totient is φ = 81588550292480.

The previous prime is 165221400536081. The next prime is 165221400536149. The reversal of 165221400536144 is 441635004122561.

It is a happy number.

It is a super-2 number, since 2×165221400536144² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165221400536095 and 165221400536104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221400536149) 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, 16417604 + ... + 24494499.

Almost surely, 2^{165221400536144} is an apocalyptic number.

It is an amenable number.

165221400536144 is a deficient number, since it is larger than the sum of its proper divisors (158858430902128).

165221400536144 is a wasteful number, since it uses less digits than its factorization.

165221400536144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40915235 (or 40915229 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 165221400536144 in words is "one hundred sixty-five trillion, two hundred twenty-one billion, four hundred million, five hundred thirty-six thousand, one hundred forty-four".