66191651483 has 4 divisors (see below), whose sum is σ = 66304414680. Its totient is φ = 66078888288.

The previous prime is 66191651467. The next prime is 66191651543. The reversal of 66191651483 is 38415619166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66191651483 - 2⁴ = 66191651467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66191651783) 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, 56380718 + ... + 56381891.

It is an arithmetic number, because the mean of its divisors is an integer number (16576103670).

Almost surely, 2^66191651483 is an apocalyptic number.

66191651483 is a deficient number, since it is larger than the sum of its proper divisors (112763197).

66191651483 is a wasteful number, since it uses less digits than its factorization.

66191651483 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112763196.

The product of its digits is 933120, while the sum is 50.

The spelling of 66191651483 in words is "sixty-six billion, one hundred ninety-one million, six hundred fifty-one thousand, four hundred eighty-three".