66137871 has 16 divisors (see below), whose sum is σ = 93775968. Its totient is φ = 41318400.

The previous prime is 66137867. The next prime is 66137873. The reversal of 66137871 is 17873166.

It is not a de Polignac number, because 66137871 - 2² = 66137867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66137873) 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, 9601 + ... + 14981.

It is an arithmetic number, because the mean of its divisors is an integer number (5860998).

Almost surely, 2^66137871 is an apocalyptic number.

66137871 is a deficient number, since it is larger than the sum of its proper divisors (27638097).

66137871 is a wasteful number, since it uses less digits than its factorization.

66137871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642.

The product of its digits is 42336, while the sum is 39.

The square root of 66137871 is about 8132.5193513449. The cubic root of 66137871 is about 404.4052052365.

The spelling of 66137871 in words is "sixty-six million, one hundred thirty-seven thousand, eight hundred seventy-one".