66356994 has 16 divisors (see below), whose sum is σ = 144779040. Its totient is φ = 20108160.

The previous prime is 66356989. The next prime is 66356999. The reversal of 66356994 is 49965366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66356989) and next prime (66356999).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66356999) 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, 502639 + ... + 502770.

It is an arithmetic number, because the mean of its divisors is an integer number (9048690).

Almost surely, 2^66356994 is an apocalyptic number.

66356994 is an abundant number, since it is smaller than the sum of its proper divisors (78422046).

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

66356994 is a wasteful number, since it uses less digits than its factorization.

66356994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005425.

The product of its digits is 1049760, while the sum is 48.

The square root of 66356994 is about 8145.9802356745. The cubic root of 66356994 is about 404.8513278416.

The spelling of 66356994 in words is "sixty-six million, three hundred fifty-six thousand, nine hundred ninety-four".