66771001 has 24 divisors (see below), whose sum is σ = 78403392. Its totient is φ = 56284800.

The previous prime is 66770987. The next prime is 66771011. The reversal of 66771001 is 10017766.

It is not a de Polignac number, because 66771001 - 2⁵ = 66770969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66771011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425215 + ... + 425371.

It is an arithmetic number, because the mean of its divisors is an integer number (3266808).

Almost surely, 2^66771001 is an apocalyptic number.

It is an amenable number.

66771001 is a deficient number, since it is larger than the sum of its proper divisors (11632391).

66771001 is a wasteful number, since it uses less digits than its factorization.

66771001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 66771001 is about 8171.3524584367. The cubic root of 66771001 is about 405.6915502830.

Adding to 66771001 its reverse (10017766), we get a palindrome (76788767).

The spelling of 66771001 in words is "sixty-six million, seven hundred seventy-one thousand, one".