66610880801 has 4 divisors (see below), whose sum is σ = 68028133632. Its totient is φ = 65193627972.

The previous prime is 66610880747. The next prime is 66610880803. The reversal of 66610880801 is 10808801666.

It is a happy number.

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 66610880801 - 2⁶ = 66610880737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66610880803) 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, 708626345 + ... + 708626438.

It is an arithmetic number, because the mean of its divisors is an integer number (17007033408).

Almost surely, 2^66610880801 is an apocalyptic number.

It is an amenable number.

66610880801 is a deficient number, since it is larger than the sum of its proper divisors (1417252831).

66610880801 is a wasteful number, since it uses less digits than its factorization.

66610880801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417252830.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 66610880801 in words is "sixty-six billion, six hundred ten million, eight hundred eighty thousand, eight hundred one".