66761807271 has 8 divisors (see below), whose sum is σ = 89021347584. Its totient is φ = 44505069240.

The previous prime is 66761807263. The next prime is 66761807291. The reversal of 66761807271 is 17270816766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66761807271 - 2³ = 66761807263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761807221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644335 + ... + 740736.

It is an arithmetic number, because the mean of its divisors is an integer number (11127668448).

Almost surely, 2^66761807271 is an apocalyptic number.

66761807271 is a deficient number, since it is larger than the sum of its proper divisors (22259540313).

66761807271 is a wasteful number, since it uses less digits than its factorization.

66761807271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401141.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 66761807271 in words is "sixty-six billion, seven hundred sixty-one million, eight hundred seven thousand, two hundred seventy-one".