66791466 has 96 divisors (see below), whose sum is σ = 177690240. Its totient is φ = 18398016.

The previous prime is 66791449. The next prime is 66791467. The reversal of 66791466 is 66419766.

It is a happy number.

It is a super-2 number, since 2×66791466² = 8922199860858312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66791467) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98320 + ... + 98996.

It is an arithmetic number, because the mean of its divisors is an integer number (1850940).

Almost surely, 2^66791466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66791466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88845120).

66791466 is an abundant number, since it is smaller than the sum of its proper divisors (110898774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66791466 is a wasteful number, since it uses less digits than its factorization.

66791466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 718 counting only the distinct ones).

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

The square root of 66791466 is about 8172.6046031850. The cubic root of 66791466 is about 405.7329935711.

The spelling of 66791466 in words is "sixty-six million, seven hundred ninety-one thousand, four hundred sixty-six".