66799998 has 16 divisors (see below), whose sum is σ = 148444560. Its totient is φ = 22266648.

The previous prime is 66799979. The next prime is 66800003. The reversal of 66799998 is 89999766.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618465 + ... + 618572.

It is an arithmetic number, because the mean of its divisors is an integer number (9277785).

Almost surely, 2^66799998 is an apocalyptic number.

66799998 is an abundant number, since it is smaller than the sum of its proper divisors (81644562).

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

66799998 is a wasteful number, since it uses less digits than its factorization.

66799998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237048 (or 1237042 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The square root of 66799998 is about 8173.1265743288. The cubic root of 66799998 is about 405.7502690641.

The spelling of 66799998 in words is "sixty-six million, seven hundred ninety-nine thousand, nine hundred ninety-eight".