66612771 has 12 divisors (see below), whose sum is σ = 98266272. Its totient is φ = 43463376.

The previous prime is 66612751. The next prime is 66612773. The reversal of 66612771 is 17721666.

It is not a de Polignac number, because 66612771 - 2¹³ = 66604579 is a prime.

It is a super-2 number, since 2×66612771² = 8874522520596882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66612773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78316 + ... + 79161.

It is an arithmetic number, because the mean of its divisors is an integer number (8188856).

Almost surely, 2^66612771 is an apocalyptic number.

66612771 is a deficient number, since it is larger than the sum of its proper divisors (31653501).

66612771 is a wasteful number, since it uses less digits than its factorization.

66612771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157530 (or 157527 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 66612771 is about 8161.6647198963. The cubic root of 66612771 is about 405.3708354692.

The spelling of 66612771 in words is "sixty-six million, six hundred twelve thousand, seven hundred seventy-one".