66156345 has 40 divisors (see below), whose sum is σ = 119180160. Its totient is φ = 35108640.

The previous prime is 66156289. The next prime is 66156353. The reversal of 66156345 is 54365166.

66156345 is a `hidden beast` number, since 6 + 6 + 15 + 634 + 5 = 666.

It is not a de Polignac number, because 66156345 - 2⁸ = 66156089 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 153280 + ... + 153710.

It is an arithmetic number, because the mean of its divisors is an integer number (2979504).

Almost surely, 2^66156345 is an apocalyptic number.

It is an amenable number.

66156345 is a deficient number, since it is larger than the sum of its proper divisors (53023815).

66156345 is a wasteful number, since it uses less digits than its factorization.

66156345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 818 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66156345 is about 8133.6550824337. The cubic root of 66156345 is about 404.4428553057.

The spelling of 66156345 in words is "sixty-six million, one hundred fifty-six thousand, three hundred forty-five".