66851503868471 has 6 divisors (see below), whose sum is σ = 77766035112360. Its totient is φ = 57301289030076.

The previous prime is 66851503868441. The next prime is 66851503868503. The reversal of 66851503868471 is 17486830515866.

It is not a de Polignac number, because 66851503868471 - 2⁴² = 62453457357367 is a prime.

It is a super-3 number, since 3×66851503868471³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66851503868441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 682158202691 + ... + 682158202788.

It is an arithmetic number, because the mean of its divisors is an integer number (12961005852060).

Almost surely, 2^{66851503868471} is an apocalyptic number.

66851503868471 is a deficient number, since it is larger than the sum of its proper divisors (10914531243889).

66851503868471 is a wasteful number, since it uses less digits than its factorization.

66851503868471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364316405493 (or 1364316405486 counting only the distinct ones).

The product of its (nonzero) digits is 232243200, while the sum is 68.

The spelling of 66851503868471 in words is "sixty-six trillion, eight hundred fifty-one billion, five hundred three million, eight hundred sixty-eight thousand, four hundred seventy-one".