66687039 has 18 divisors (see below), whose sum is σ = 102329240. Its totient is φ = 41841216.

The previous prime is 66687011. The next prime is 66687053. The reversal of 66687039 is 93078666.

It is not a de Polignac number, because 66687039 - 2⁵ = 66687007 is a prime.

It is a super-2 number, since 2×66687039² = 8894322341175042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66686985 and 66687003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66687059) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10219 + ... + 15420.

Almost surely, 2^66687039 is an apocalyptic number.

66687039 is a deficient number, since it is larger than the sum of its proper divisors (35642201).

66687039 is a wasteful number, since it uses less digits than its factorization.

66687039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25679 (or 25659 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66687039 is about 8166.2132595224. The cubic root of 66687039 is about 405.5214317139.

The spelling of 66687039 in words is "sixty-six million, six hundred eighty-seven thousand, thirty-nine".