535666215421620 has 384 divisors, whose sum is σ = 1694807815680000. Its totient is φ = 140432585932800.

The previous prime is 535666215421609. The next prime is 535666215421627. The reversal of 535666215421620 is 26124512666535.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (535666215421627) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 22746865606 + ... + 22746889154.

It is an arithmetic number, because the mean of its divisors is an integer number (4413562020000).

Almost surely, 2^{535666215421620} 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 535666215421620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847403907840000).

535666215421620 is an abundant number, since it is smaller than the sum of its proper divisors (1159141600258380).

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

535666215421620 is a wasteful number, since it uses less digits than its factorization.

535666215421620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25480 (or 25472 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 535666215421620 in words is "five hundred thirty-five trillion, six hundred sixty-six billion, two hundred fifteen million, four hundred twenty-one thousand, six hundred twenty".