202102661440 has 112 divisors (see below), whose sum is σ = 487494510912. Its totient is φ = 79798726656.

The previous prime is 202102661429. The next prime is 202102661459. The reversal of 202102661440 is 44166201202.

It is a super-2 number, since 2×202102661440² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202102661399 and 202102661408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9679492 + ... + 9700348.

Almost surely, 2^202102661440 is an apocalyptic number.

202102661440 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 202102661440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243747255456).

202102661440 is an abundant number, since it is smaller than the sum of its proper divisors (285391849472).

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

202102661440 is a wasteful number, since it uses less digits than its factorization.

202102661440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21264 (or 21254 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 202102661440 its reverse (44166201202), we get a palindrome (246268862642).

The spelling of 202102661440 in words is "two hundred two billion, one hundred two million, six hundred sixty-one thousand, four hundred forty".