66715672 has 16 divisors (see below), whose sum is σ = 125256240. Its totient is φ = 33314016.

The previous prime is 66715643. The next prime is 66715673. The reversal of 66715672 is 27651766.

It is a happy number.

It is a super-3 number, since 3×66715672³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66715673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518 + ... + 11650.

It is an arithmetic number, because the mean of its divisors is an integer number (7828515).

Almost surely, 2^66715672 is an apocalyptic number.

It is an amenable number.

66715672 is a deficient number, since it is larger than the sum of its proper divisors (58540568).

66715672 is a wasteful number, since it uses less digits than its factorization.

66715672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962 (or 10958 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 66715672 is about 8167.9662095285. The cubic root of 66715672 is about 405.5794621493.

The spelling of 66715672 in words is "sixty-six million, seven hundred fifteen thousand, six hundred seventy-two".