66361687 has 6 divisors (see below), whose sum is σ = 75866568. Its totient is φ = 56862972.

The previous prime is 66361663. The next prime is 66361709. The reversal of 66361687 is 78616366.

It is not a de Polignac number, because 66361687 - 2¹¹ = 66359639 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 (66361787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20014 + ... + 23092.

It is an arithmetic number, because the mean of its divisors is an integer number (12644428).

Almost surely, 2^66361687 is an apocalyptic number.

66361687 is a deficient number, since it is larger than the sum of its proper divisors (9504881).

66361687 is an frugal number, since it uses more digits than its factorization.

66361687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6165 (or 3086 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 66361687 is about 8146.2682867679. The cubic root of 66361687 is about 404.8608717865.

The spelling of 66361687 in words is "sixty-six million, three hundred sixty-one thousand, six hundred eighty-seven".