66312822 has 16 divisors (see below), whose sum is σ = 133866432. Its totient is φ = 21897480.

The previous prime is 66312811. The next prime is 66312823. The reversal of 66312822 is 22821366.

It is a self number, because there is not a number n which added to its sum of digits gives 66312822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66312823) 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, 51004 + ... + 52287.

It is an arithmetic number, because the mean of its divisors is an integer number (8366652).

Almost surely, 2^66312822 is an apocalyptic number.

66312822 is an abundant number, since it is smaller than the sum of its proper divisors (67553610).

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

66312822 is a wasteful number, since it uses less digits than its factorization.

66312822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103403.

The product of its digits is 6912, while the sum is 30.

The square root of 66312822 is about 8143.2685084062. The cubic root of 66312822 is about 404.7614751557.

It can be divided in two parts, 6631 and 2822, that added together give a triangular number (9453 = T₁₃₇).

The spelling of 66312822 in words is "sixty-six million, three hundred twelve thousand, eight hundred twenty-two".