66354354869496 has 128 divisors (see below), whose sum is σ = 173269515666240. Its totient is φ = 21157086412800.

The previous prime is 66354354869459. The next prime is 66354354869497. The reversal of 66354354869496 is 69496845345366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66354354869497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17021596 + ... + 20553428.

Almost surely, 2^{66354354869496} 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 66354354869496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86634757833120).

66354354869496 is an abundant number, since it is smaller than the sum of its proper divisors (106915160796744).

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

66354354869496 is a wasteful number, since it uses less digits than its factorization.

66354354869496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532257 (or 3532253 counting only the distinct ones).

The product of its digits is 12093235200, while the sum is 78.

The spelling of 66354354869496 in words is "sixty-six trillion, three hundred fifty-four billion, three hundred fifty-four million, eight hundred sixty-nine thousand, four hundred ninety-six".