66837251851 has 4 divisors (see below), whose sum is σ = 67023428400. Its totient is φ = 66651075304.

The previous prime is 66837251849. The next prime is 66837251893. The reversal of 66837251851 is 15815273866.

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 66837251851 - 2¹ = 66837251849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66837251821) 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, 93087736 + ... + 93088453.

It is an arithmetic number, because the mean of its divisors is an integer number (16755857100).

Almost surely, 2^66837251851 is an apocalyptic number.

66837251851 is a deficient number, since it is larger than the sum of its proper divisors (186176549).

66837251851 is a wasteful number, since it uses less digits than its factorization.

66837251851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186176548.

The product of its digits is 2419200, while the sum is 52.

The spelling of 66837251851 in words is "sixty-six billion, eight hundred thirty-seven million, two hundred fifty-one thousand, eight hundred fifty-one".