66911745 has 16 divisors (see below), whose sum is σ = 113356800. Its totient is φ = 33586944.

The previous prime is 66911737. The next prime is 66911753. The reversal of 66911745 is 54711966.

It is an interprime number because it is at equal distance from previous prime (66911737) and next prime (66911753).

It is not a de Polignac number, because 66911745 - 2³ = 66911737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130945 + ... + 131454.

It is an arithmetic number, because the mean of its divisors is an integer number (7084800).

Almost surely, 2^66911745 is an apocalyptic number.

It is an amenable number.

66911745 is a deficient number, since it is larger than the sum of its proper divisors (46445055).

66911745 is a wasteful number, since it uses less digits than its factorization.

66911745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262424.

The product of its digits is 45360, while the sum is 39.

The square root of 66911745 is about 8179.9599632272. The cubic root of 66911745 is about 405.9763973919.

The spelling of 66911745 in words is "sixty-six million, nine hundred eleven thousand, seven hundred forty-five".