2161402243640 has 64 divisors (see below), whose sum is σ = 4884082932960. Its totient is φ = 860841492480.

The previous prime is 2161402243577. The next prime is 2161402243669. The reversal of 2161402243640 is 463422041612.

It is a self number, because there is not a number n which added to its sum of digits gives 2161402243640.

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, 84308264 + ... + 84333896.

Almost surely, 2^{2161402243640} is an apocalyptic number.

2161402243640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161402243640 is an abundant number, since it is smaller than the sum of its proper divisors (2722680689320).

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

2161402243640 is a wasteful number, since it uses less digits than its factorization.

2161402243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34632 (or 34628 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

It can be divided in two parts, 2161402 and 243640, that added together give a palindrome (2405042).

The spelling of 2161402243640 in words is "two trillion, one hundred sixty-one billion, four hundred two million, two hundred forty-three thousand, six hundred forty".