66804387701 has 4 divisors (see below), whose sum is σ = 66806987904. Its totient is φ = 66801787500.

The previous prime is 66804387659. The next prime is 66804387743. The reversal of 66804387701 is 10778340866.

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 an interprime number because it is at equal distance from previous prime (66804387659) and next prime (66804387743).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66804387701 is a prime.

It is a super-2 number, since 2×66804387701² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66804387701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66804387761) 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, 1261175 + ... + 1313076.

It is an arithmetic number, because the mean of its divisors is an integer number (16701746976).

Almost surely, 2^66804387701 is an apocalyptic number.

It is an amenable number.

66804387701 is a deficient number, since it is larger than the sum of its proper divisors (2600203).

66804387701 is a wasteful number, since it uses less digits than its factorization.

66804387701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600202.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 66804387701 in words is "sixty-six billion, eight hundred four million, three hundred eighty-seven thousand, seven hundred one".