66774537 has 20 divisors (see below), whose sum is σ = 100248016. Its totient is φ = 44294040.

The previous prime is 66774523. The next prime is 66774553. The reversal of 66774537 is 73547766.

It is not a de Polignac number, because 66774537 - 2¹⁵ = 66741769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66774492 and 66774501.

It is not an unprimeable number, because it can be changed into a prime (66774557) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15138 + ... + 19044.

Almost surely, 2^66774537 is an apocalyptic number.

It is an amenable number.

66774537 is a deficient number, since it is larger than the sum of its proper divisors (33473479).

66774537 is a wasteful number, since it uses less digits than its factorization.

66774537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130 (or 4121 counting only the distinct ones).

The product of its digits is 740880, while the sum is 45.

The square root of 66774537 is about 8171.5688212240. The cubic root of 66774537 is about 405.6987115754.

The spelling of 66774537 in words is "sixty-six million, seven hundred seventy-four thousand, five hundred thirty-seven".