66791554 has 16 divisors (see below), whose sum is σ = 102643200. Its totient is φ = 32584240.

The previous prime is 66791551. The next prime is 66791573. The reversal of 66791554 is 45519766.

66791554 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66791554² = 8922223371469832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66791554.

It is not an unprimeable number, because it can be changed into a prime (66791551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18597 + ... + 21895.

It is an arithmetic number, because the mean of its divisors is an integer number (6415200).

Almost surely, 2^66791554 is an apocalyptic number.

66791554 is a deficient number, since it is larger than the sum of its proper divisors (35851646).

66791554 is a wasteful number, since it uses less digits than its factorization.

66791554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3545.

The product of its digits is 226800, while the sum is 43.

The square root of 66791554 is about 8172.6099870237. The cubic root of 66791554 is about 405.7331717600.

The spelling of 66791554 in words is "sixty-six million, seven hundred ninety-one thousand, five hundred fifty-four".