66671080777 has 16 divisors (see below), whose sum is σ = 80685002880. Its totient is φ = 53780145408.

The previous prime is 66671080759. The next prime is 66671080787. The reversal of 66671080777 is 77708017666.

It is a cyclic number.

It is not a de Polignac number, because 66671080777 - 2²³ = 66662692169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66671080727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1855143 + ... + 1890739.

It is an arithmetic number, because the mean of its divisors is an integer number (5042812680).

Almost surely, 2^66671080777 is an apocalyptic number.

It is an amenable number.

66671080777 is a deficient number, since it is larger than the sum of its proper divisors (14013922103).

66671080777 is a wasteful number, since it uses less digits than its factorization.

66671080777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51360.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The spelling of 66671080777 in words is "sixty-six billion, six hundred seventy-one million, eighty thousand, seven hundred seventy-seven".