66770207766 has 32 divisors (see below), whose sum is σ = 149847343200. Its totient is φ = 22036370400.

The previous prime is 66770207761. The next prime is 66770207767.

66770207766 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66770207766² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770207761) 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, 6115761 + ... + 6126668.

It is an arithmetic number, because the mean of its divisors is an integer number (4682729475).

Almost surely, 2^66770207766 is an apocalyptic number.

66770207766 is an abundant number, since it is smaller than the sum of its proper divisors (83077135434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66770207766 is a wasteful number, since it uses less digits than its factorization.

66770207766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12242541 (or 12242535 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 54.

The spelling of 66770207766 in words is "sixty-six billion, seven hundred seventy million, two hundred seven thousand, seven hundred sixty-six".