66128377371 has 16 divisors (see below), whose sum is σ = 100922817024. Its totient is φ = 37729232064.

The previous prime is 66128377321. The next prime is 66128377409. The reversal of 66128377371 is 17377382166.

It is not a de Polignac number, because 66128377371 - 2²¹ = 66126280219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66128377321) 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, 2419930 + ... + 2447103.

It is an arithmetic number, because the mean of its divisors is an integer number (6307676064).

Almost surely, 2^66128377371 is an apocalyptic number.

66128377371 is a deficient number, since it is larger than the sum of its proper divisors (34794439653).

66128377371 is a wasteful number, since it uses less digits than its factorization.

66128377371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4867690.

The product of its digits is 1778112, while the sum is 51.

The spelling of 66128377371 in words is "sixty-six billion, one hundred twenty-eight million, three hundred seventy-seven thousand, three hundred seventy-one".