66412869408 has 120 divisors (see below), whose sum is σ = 196063072128. Its totient is φ = 22053223296.

The previous prime is 66412869389. The next prime is 66412869427. The reversal of 66412869408 is 80496821466.

66412869408 is a `hidden beast` number, since 66 + 412 + 86 + 94 + 0 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (66412869389) and next prime (66412869427).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 632985 + ... + 730407.

Almost surely, 2^66412869408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66412869408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98031536064).

66412869408 is an abundant number, since it is smaller than the sum of its proper divisors (129650202720).

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

66412869408 is a wasteful number, since it uses less digits than its factorization.

66412869408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97708 (or 97691 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 66412869408 in words is "sixty-six billion, four hundred twelve million, eight hundred sixty-nine thousand, four hundred eight".