164981211544 has 32 divisors (see below), whose sum is σ = 315356976000. Its totient is φ = 80887802112.

The previous prime is 164981211509. The next prime is 164981211569. The reversal of 164981211544 is 445112189461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 164981211494 and 164981211503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635212 + ... + 856420.

It is an arithmetic number, because the mean of its divisors is an integer number (9854905500).

Almost surely, 2^164981211544 is an apocalyptic number.

It is an amenable number.

164981211544 is a deficient number, since it is larger than the sum of its proper divisors (150375764456).

164981211544 is a wasteful number, since it uses less digits than its factorization.

164981211544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223027 (or 223023 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The spelling of 164981211544 in words is "one hundred sixty-four billion, nine hundred eighty-one million, two hundred eleven thousand, five hundred forty-four".