66750645 has 32 divisors (see below), whose sum is σ = 115420032. Its totient is φ = 32746752.

The previous prime is 66750637. The next prime is 66750661. The reversal of 66750645 is 54605766.

It is not a de Polignac number, because 66750645 - 2³ = 66750637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 90699 + ... + 91431.

It is an arithmetic number, because the mean of its divisors is an integer number (3606876).

Almost surely, 2^66750645 is an apocalyptic number.

66750645 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66750645 is a deficient number, since it is larger than the sum of its proper divisors (48669387).

66750645 is a wasteful number, since it uses less digits than its factorization.

66750645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66750645 is about 8170.1067924477. The cubic root of 66750645 is about 405.6503193273.

The spelling of 66750645 in words is "sixty-six million, seven hundred fifty thousand, six hundred forty-five".