2116781532 has 24 divisors (see below), whose sum is σ = 5487952400. Its totient is φ = 705593808.

The previous prime is 2116781521. The next prime is 2116781539. The reversal of 2116781532 is 2351876112.

2116781532 is a `hidden beast` number, since 2 + 116 + 7 + 8 + 1 + 532 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116781539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9799807 + ... + 9800022.

Almost surely, 2^2116781532 is an apocalyptic number.

It is an amenable number.

2116781532 is an abundant number, since it is smaller than the sum of its proper divisors (3371170868).

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

2116781532 is a wasteful number, since it uses less digits than its factorization.

2116781532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19599842 (or 19599834 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2116781532 is about 46008.4941288019. The cubic root of 2116781532 is about 1283.9812426293.

The spelling of 2116781532 in words is "two billion, one hundred sixteen million, seven hundred eighty-one thousand, five hundred thirty-two".