66807078101 has 4 divisors (see below), whose sum is σ = 66814910400. Its totient is φ = 66799245804.

The previous prime is 66807078083. The next prime is 66807078137. The reversal of 66807078101 is 10187070866.

66807078101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66807078101 is a prime.

It is a super-2 number, since 2×66807078101² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66807078161) 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, 3903341 + ... + 3920418.

It is an arithmetic number, because the mean of its divisors is an integer number (16703727600).

Almost surely, 2^66807078101 is an apocalyptic number.

It is an amenable number.

66807078101 is a deficient number, since it is larger than the sum of its proper divisors (7832299).

66807078101 is an equidigital number, since it uses as much as digits as its factorization.

66807078101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832298.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 66807078101 in words is "sixty-six billion, eight hundred seven million, seventy-eight thousand, one hundred one".