164721125542 has 16 divisors (see below), whose sum is σ = 250083650880. Its totient is φ = 81360107752.

The previous prime is 164721125539. The next prime is 164721125551. The reversal of 164721125542 is 245521127461.

It is a junction number, because it is equal to n+sod(n) for n = 164721125495 and 164721125504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1822209 + ... + 1910467.

It is an arithmetic number, because the mean of its divisors is an integer number (15630228180).

Almost surely, 2^164721125542 is an apocalyptic number.

164721125542 is a deficient number, since it is larger than the sum of its proper divisors (85362525338).

164721125542 is a wasteful number, since it uses less digits than its factorization.

164721125542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99587.

The product of its digits is 134400, while the sum is 40.

The spelling of 164721125542 in words is "one hundred sixty-four billion, seven hundred twenty-one million, one hundred twenty-five thousand, five hundred forty-two".