66980761 has 8 divisors (see below), whose sum is σ = 70879104. Its totient is φ = 63164640.

The previous prime is 66980759. The next prime is 66980773. The reversal of 66980761 is 16708966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66980761 - 2¹ = 66980759 is a prime.

It is a super-3 number, since 3×66980761³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66980791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18876 + ... + 22141.

It is an arithmetic number, because the mean of its divisors is an integer number (8859888).

Almost surely, 2^66980761 is an apocalyptic number.

It is an amenable number.

66980761 is a deficient number, since it is larger than the sum of its proper divisors (3898343).

66980761 is a wasteful number, since it uses less digits than its factorization.

66980761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41111.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 66980761 is about 8184.1774785253. The cubic root of 66980761 is about 406.1159306394.

The spelling of 66980761 in words is "sixty-six million, nine hundred eighty thousand, seven hundred sixty-one".