66993513 has 8 divisors (see below), whose sum is σ = 89508576. Its totient is φ = 44570400.

The previous prime is 66993499. The next prime is 66993517. The reversal of 66993513 is 31539966.

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

It is not a de Polignac number, because 66993513 - 2¹⁰ = 66992489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66993517) 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, 21268 + ... + 24213.

It is an arithmetic number, because the mean of its divisors is an integer number (11188572).

Almost surely, 2^66993513 is an apocalyptic number.

It is an amenable number.

66993513 is a deficient number, since it is larger than the sum of its proper divisors (22515063).

66993513 is a wasteful number, since it uses less digits than its factorization.

66993513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45975.

The product of its digits is 131220, while the sum is 42.

The square root of 66993513 is about 8184.9565056877. The cubic root of 66993513 is about 406.1417015307.

The spelling of 66993513 in words is "sixty-six million, nine hundred ninety-three thousand, five hundred thirteen".