166542917555 has 32 divisors (see below), whose sum is σ = 230868817920. Its totient is φ = 112970390400.

The previous prime is 166542917533. The next prime is 166542917561. The reversal of 166542917555 is 555719245661.

It is not a de Polignac number, because 166542917555 - 2¹⁶ = 166542852019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166542917555.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2593526 + ... + 2656964.

It is an arithmetic number, because the mean of its divisors is an integer number (7214650560).

Almost surely, 2^166542917555 is an apocalyptic number.

166542917555 is a deficient number, since it is larger than the sum of its proper divisors (64325900365).

166542917555 is a wasteful number, since it uses less digits than its factorization.

166542917555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64259.

The product of its digits is 11340000, while the sum is 56.

The spelling of 166542917555 in words is "one hundred sixty-six billion, five hundred forty-two million, nine hundred seventeen thousand, five hundred fifty-five".