66502332161 has 4 divisors (see below), whose sum is σ = 67123849392. Its totient is φ = 65880814932.

The previous prime is 66502332137. The next prime is 66502332271. The reversal of 66502332161 is 16123320566.

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 a de Polignac number, because none of the positive numbers 2^k-66502332161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66502332121) 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, 310758455 + ... + 310758668.

It is an arithmetic number, because the mean of its divisors is an integer number (16780962348).

Almost surely, 2^66502332161 is an apocalyptic number.

It is an amenable number.

66502332161 is a deficient number, since it is larger than the sum of its proper divisors (621517231).

66502332161 is a wasteful number, since it uses less digits than its factorization.

66502332161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621517230.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 66502332161 in words is "sixty-six billion, five hundred two million, three hundred thirty-two thousand, one hundred sixty-one".