66061777 has 8 divisors (see below), whose sum is σ = 67081320. Its totient is φ = 65049600.

The previous prime is 66061757. The next prime is 66061817. The reversal of 66061777 is 77716066.

66061777 = T₁₅₈ + T₁₅₉ + ... + T₇₃₆.

It can be written as a sum of positive squares in 4 ways, for example, as 37748736 + 28313041 = 6144^2 + 5321^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66061777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66061747) 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, 17799 + ... + 21187.

It is an arithmetic number, because the mean of its divisors is an integer number (8385165).

Almost surely, 2^66061777 is an apocalyptic number.

It is an amenable number.

66061777 is a deficient number, since it is larger than the sum of its proper divisors (1019543).

66061777 is a wasteful number, since it uses less digits than its factorization.

66061777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 66061777 is about 8127.8396268627. The cubic root of 66061777 is about 404.2500514720.

The spelling of 66061777 in words is "sixty-six million, sixty-one thousand, seven hundred seventy-seven".