66861413313 has 8 divisors (see below), whose sum is σ = 89463564768. Its totient is φ = 44416768704.

The previous prime is 66861413239. The next prime is 66861413341. The reversal of 66861413313 is 31331416866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66861413313 - 2²⁶ = 66794304449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66861413393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39375720 + ... + 39377417.

It is an arithmetic number, because the mean of its divisors is an integer number (11182945596).

Almost surely, 2^66861413313 is an apocalyptic number.

It is an amenable number.

66861413313 is a deficient number, since it is larger than the sum of its proper divisors (22602151455).

66861413313 is a wasteful number, since it uses less digits than its factorization.

66861413313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78753423.

The product of its digits is 186624, while the sum is 42.

The spelling of 66861413313 in words is "sixty-six billion, eight hundred sixty-one million, four hundred thirteen thousand, three hundred thirteen".