66107571527731 has 4 divisors (see below), whose sum is σ = 66117632038264. Its totient is φ = 66097511017200.

The previous prime is 66107571527713. The next prime is 66107571527737. The reversal of 66107571527731 is 13772517570166.

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

It is a cyclic number.

It is not a de Polignac number, because 66107571527731 - 2³⁷ = 65970132574259 is a prime.

It is a super-2 number, since 2×66107571527731² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66107571527737) 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, 5030245410 + ... + 5030258551.

It is an arithmetic number, because the mean of its divisors is an integer number (16529408009566).

Almost surely, 2^{66107571527731} is an apocalyptic number.

66107571527731 is a deficient number, since it is larger than the sum of its proper divisors (10060510533).

66107571527731 is a wasteful number, since it uses less digits than its factorization.

66107571527731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10060510532.

The product of its (nonzero) digits is 12965400, while the sum is 58.

The spelling of 66107571527731 in words is "sixty-six trillion, one hundred seven billion, five hundred seventy-one million, five hundred twenty-seven thousand, seven hundred thirty-one".