66402011687 has 8 divisors (see below), whose sum is σ = 74775286272. Its totient is φ = 58418191800.

The previous prime is 66402011657. The next prime is 66402011707. The reversal of 66402011687 is 78611020466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66402011687 - 2¹² = 66402007591 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 (66402011657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97363313 + ... + 97363994.

It is an arithmetic number, because the mean of its divisors is an integer number (9346910784).

Almost surely, 2^66402011687 is an apocalyptic number.

66402011687 is a deficient number, since it is larger than the sum of its proper divisors (8373274585).

66402011687 is a wasteful number, since it uses less digits than its factorization.

66402011687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194727349.

The product of its (nonzero) digits is 96768, while the sum is 41.

The spelling of 66402011687 in words is "sixty-six billion, four hundred two million, eleven thousand, six hundred eighty-seven".