166033515978 has 48 divisors (see below), whose sum is σ = 395686242432. Its totient is φ = 50313179400.

The previous prime is 166033515971. The next prime is 166033515979. The reversal of 166033515978 is 879515330661.

166033515978 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 33 + 515 + 97 + 8 = 666.

166033515978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166033515971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3441138 + ... + 3489053.

It is an arithmetic number, because the mean of its divisors is an integer number (8243463384).

Almost surely, 2^166033515978 is an apocalyptic number.

166033515978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166033515978 is an abundant number, since it is smaller than the sum of its proper divisors (229652726454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166033515978 is a wasteful number, since it uses less digits than its factorization.

166033515978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930232 (or 6930207 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 166033515978 in words is "one hundred sixty-six billion, thirty-three million, five hundred fifteen thousand, nine hundred seventy-eight".