66405070377 has 32 divisors (see below), whose sum is σ = 101794080000. Its totient is φ = 42733474560.

The previous prime is 66405070373. The next prime is 66405070393. The reversal of 66405070377 is 77307050466.

It is not a de Polignac number, because 66405070377 - 2² = 66405070373 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66405070373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4846977 + ... + 4860657.

It is an arithmetic number, because the mean of its divisors is an integer number (3181065000).

Almost surely, 2^66405070377 is an apocalyptic number.

It is an amenable number.

66405070377 is a deficient number, since it is larger than the sum of its proper divisors (35389009623).

66405070377 is a wasteful number, since it uses less digits than its factorization.

66405070377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19918 (or 19912 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The spelling of 66405070377 in words is "sixty-six billion, four hundred five million, seventy thousand, three hundred seventy-seven".