66811373701 has 4 divisors (see below), whose sum is σ = 66858194592. Its totient is φ = 66764552812.

The previous prime is 66811373663. The next prime is 66811373773. The reversal of 66811373701 is 10737311866.

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 not a de Polignac number, because 66811373701 - 2¹⁵ = 66811340933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66811376701) 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, 23408305 + ... + 23411158.

It is an arithmetic number, because the mean of its divisors is an integer number (16714548648).

Almost surely, 2^66811373701 is an apocalyptic number.

It is an amenable number.

66811373701 is a deficient number, since it is larger than the sum of its proper divisors (46820891).

66811373701 is a wasteful number, since it uses less digits than its factorization.

66811373701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46820890.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 66811373701 in words is "sixty-six billion, eight hundred eleven million, three hundred seventy-three thousand, seven hundred one".