127766601666 has 128 divisors (see below), whose sum is σ = 315160243200. Its totient is φ = 38044702080.

The previous prime is 127766601659. The next prime is 127766601673. The reversal of 127766601666 is 666106667721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (127766601659) and next prime (127766601673).

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8609745 + ... + 8624571.

It is an arithmetic number, because the mean of its divisors is an integer number (2462189400).

Almost surely, 2^127766601666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 127766601666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157580121600).

127766601666 is an abundant number, since it is smaller than the sum of its proper divisors (187393641534).

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

127766601666 is a wasteful number, since it uses less digits than its factorization.

127766601666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15101 (or 15095 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 54.

The spelling of 127766601666 in words is "one hundred twenty-seven billion, seven hundred sixty-six million, six hundred one thousand, six hundred sixty-six".