66478537 has 8 divisors (see below), whose sum is σ = 67233600. Its totient is φ = 65728080.

The previous prime is 66478523. The next prime is 66478547. The reversal of 66478537 is 73587466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66478537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66478547) 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, 33462 + ... + 35392.

It is an arithmetic number, because the mean of its divisors is an integer number (8404200).

Almost surely, 2^66478537 is an apocalyptic number.

It is an amenable number.

66478537 is a deficient number, since it is larger than the sum of its proper divisors (755063).

66478537 is a wasteful number, since it uses less digits than its factorization.

66478537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303.

The product of its digits is 846720, while the sum is 46.

The square root of 66478537 is about 8153.4371279847. The cubic root of 66478537 is about 405.0983594867.

The spelling of 66478537 in words is "sixty-six million, four hundred seventy-eight thousand, five hundred thirty-seven".