166542917554 has 32 divisors (see below), whose sum is σ = 280310184000. Its totient is φ = 73681441344.

The previous prime is 166542917533. The next prime is 166542917561. The reversal of 166542917554 is 455719245661.

It is a junction number, because it is equal to n+sod(n) for n = 166542917495 and 166542917504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689724 + ... + 899335.

It is an arithmetic number, because the mean of its divisors is an integer number (8759693250).

Almost surely, 2^166542917554 is an apocalyptic number.

166542917554 is a deficient number, since it is larger than the sum of its proper divisors (113767266446).

166542917554 is a wasteful number, since it uses less digits than its factorization.

166542917554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589242.

The product of its digits is 9072000, while the sum is 55.

The spelling of 166542917554 in words is "one hundred sixty-six billion, five hundred forty-two million, nine hundred seventeen thousand, five hundred fifty-four".