215500606620 has 144 divisors (see below), whose sum is σ = 658161735840. Its totient is φ = 52373647872.

The previous prime is 215500606619. The next prime is 215500606621. The reversal of 215500606620 is 26606005512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215500606619) and next prime (215500606621).

It is a super-2 number, since 2×215500606620² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215500606621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4845846 + ... + 4890114.

It is an arithmetic number, because the mean of its divisors is an integer number (4570567610).

Almost surely, 2^215500606620 is an apocalyptic number.

215500606620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215500606620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329080867920).

215500606620 is an abundant number, since it is smaller than the sum of its proper divisors (442661129220).

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

215500606620 is a wasteful number, since it uses less digits than its factorization.

215500606620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44452 (or 44371 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 215500606620 in words is "two hundred fifteen billion, five hundred million, six hundred six thousand, six hundred twenty".