2101640533506 has 40 divisors (see below), whose sum is σ = 4715323996284. Its totient is φ = 699640532640.

The previous prime is 2101640533471. The next prime is 2101640533511. The reversal of 2101640533506 is 6053350461012.

2101640533506 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 640 + 5 + 3 + 3 + 5 + 0 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1490452747281 + 611187786225 = 1220841^2 + 781785^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8266165 + ... + 8516616.

Almost surely, 2^{2101640533506} is an apocalyptic number.

2101640533506 is an abundant number, since it is smaller than the sum of its proper divisors (2613683462778).

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

2101640533506 is a wasteful number, since it uses less digits than its factorization.

2101640533506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16783568 (or 16783559 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 2101640533506 its reverse (6053350461012), we get a palindrome (8154990994518).

The spelling of 2101640533506 in words is "two trillion, one hundred one billion, six hundred forty million, five hundred thirty-three thousand, five hundred six".