66156513533 has 4 divisors (see below), whose sum is σ = 72170742048. Its totient is φ = 60142285020.

The previous prime is 66156513529. The next prime is 66156513547. The reversal of 66156513533 is 33531565166.

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 66156513533 - 2² = 66156513529 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 (66156513593) 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, 3007114241 + ... + 3007114262.

It is an arithmetic number, because the mean of its divisors is an integer number (18042685512).

Almost surely, 2^66156513533 is an apocalyptic number.

It is an amenable number.

66156513533 is a deficient number, since it is larger than the sum of its proper divisors (6014228515).

66156513533 is a wasteful number, since it uses less digits than its factorization.

66156513533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014228514.

The product of its digits is 729000, while the sum is 44.

The spelling of 66156513533 in words is "sixty-six billion, one hundred fifty-six million, five hundred thirteen thousand, five hundred thirty-three".