66151640271 has 4 divisors (see below), whose sum is σ = 88202187032. Its totient is φ = 44101093512.

The previous prime is 66151640231. The next prime is 66151640293. The reversal of 66151640271 is 17204615166.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66151640271 - 2⁷ = 66151640143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66151640221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11025273376 + ... + 11025273381.

It is an arithmetic number, because the mean of its divisors is an integer number (22050546758).

Almost surely, 2^66151640271 is an apocalyptic number.

66151640271 is a deficient number, since it is larger than the sum of its proper divisors (22050546761).

66151640271 is a wasteful number, since it uses less digits than its factorization.

66151640271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22050546760.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 66151640271 in words is "sixty-six billion, one hundred fifty-one million, six hundred forty thousand, two hundred seventy-one".