2169996642 has 40 divisors (see below), whose sum is σ = 5304440592. Its totient is φ = 657574200.

The previous prime is 2169996641. The next prime is 2169996691. The reversal of 2169996642 is 2466999612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (2169996641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 607084 + ... + 610647.

Almost surely, 2^2169996642 is an apocalyptic number.

2169996642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2169996642 is an abundant number, since it is smaller than the sum of its proper divisors (3134443950).

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

2169996642 is a wasteful number, since it uses less digits than its factorization.

2169996642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217756 (or 1217747 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 2169996642 is about 46583.2227524030. Note that the first 3 decimals coincide. The cubic root of 2169996642 is about 1294.6519225700.

It can be divided in two parts, 21699 and 96642, that added together give a triangular number (118341 = T₄₈₆).

The spelling of 2169996642 in words is "two billion, one hundred sixty-nine million, nine hundred ninety-six thousand, six hundred forty-two".