66901963 has 4 divisors (see below), whose sum is σ = 69810768. Its totient is φ = 63993160.

The previous prime is 66901931. The next prime is 66901969. The reversal of 66901963 is 36910966.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66901963 - 2⁵ = 66901931 is a prime.

It is a super-3 number, since 3×66901963³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66901969) by changing a digit.

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, 1454368 + ... + 1454413.

It is an arithmetic number, because the mean of its divisors is an integer number (17452692).

Almost surely, 2^66901963 is an apocalyptic number.

66901963 is a deficient number, since it is larger than the sum of its proper divisors (2908805).

66901963 is a wasteful number, since it uses less digits than its factorization.

66901963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908804.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 66901963 is about 8179.3620166857. The cubic root of 66901963 is about 405.9566128501.

The spelling of 66901963 in words is "sixty-six million, nine hundred one thousand, nine hundred sixty-three".