166581655454 has 8 divisors (see below), whose sum is σ = 251128124400. Its totient is φ = 82872280656.

The previous prime is 166581655447. The next prime is 166581655463. The reversal of 166581655454 is 454556185661.

166581655454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166581655454² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166581655454.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 209273039 + ... + 209273834.

It is an arithmetic number, because the mean of its divisors is an integer number (31391015550).

Almost surely, 2^166581655454 is an apocalyptic number.

166581655454 is a deficient number, since it is larger than the sum of its proper divisors (84546468946).

166581655454 is a wasteful number, since it uses less digits than its factorization.

166581655454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418547074.

The product of its digits is 17280000, while the sum is 56.

The spelling of 166581655454 in words is "one hundred sixty-six billion, five hundred eighty-one million, six hundred fifty-five thousand, four hundred fifty-four".