66761139201 has 4 divisors (see below), whose sum is σ = 89014852272. Its totient is φ = 44507426132.

The previous prime is 66761139197. The next prime is 66761139209. The reversal of 66761139201 is 10293116766.

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 66761139201 - 2² = 66761139197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66761139209) 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, 11126856531 + ... + 11126856536.

It is an arithmetic number, because the mean of its divisors is an integer number (22253713068).

Almost surely, 2^66761139201 is an apocalyptic number.

It is an amenable number.

66761139201 is a deficient number, since it is larger than the sum of its proper divisors (22253713071).

66761139201 is a wasteful number, since it uses less digits than its factorization.

66761139201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22253713070.

The product of its (nonzero) digits is 81648, while the sum is 42.

The spelling of 66761139201 in words is "sixty-six billion, seven hundred sixty-one million, one hundred thirty-nine thousand, two hundred one".