66670780138107 has 32 divisors (see below), whose sum is σ = 91965066412032. Its totient is φ = 42939887082624.

The previous prime is 66670780138031. The next prime is 66670780138111. The reversal of 66670780138107 is 70183108707666.

It is not a de Polignac number, because 66670780138107 - 2¹² = 66670780134011 is a prime.

It is a super-3 number, since 3×66670780138107³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66670780238107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5921988 + ... + 12977345.

It is an arithmetic number, because the mean of its divisors is an integer number (2873908325376).

Almost surely, 2^{66670780138107} is an apocalyptic number.

66670780138107 is a deficient number, since it is larger than the sum of its proper divisors (25294286273925).

66670780138107 is a wasteful number, since it uses less digits than its factorization.

66670780138107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18899707.

The product of its (nonzero) digits is 14224896, while the sum is 60.

The spelling of 66670780138107 in words is "sixty-six trillion, six hundred seventy billion, seven hundred eighty million, one hundred thirty-eight thousand, one hundred seven".