2169640475 has 6 divisors (see below), whose sum is σ = 2690354220. Its totient is φ = 1735712360.

The previous prime is 2169640469. The next prime is 2169640477. The reversal of 2169640475 is 5740469612.

It is not a de Polignac number, because 2169640475 - 2¹² = 2169636379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2169640477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43392785 + ... + 43392834.

It is an arithmetic number, because the mean of its divisors is an integer number (448392370).

Almost surely, 2^2169640475 is an apocalyptic number.

2169640475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2169640475 is a deficient number, since it is larger than the sum of its proper divisors (520713745).

2169640475 is an equidigital number, since it uses as much as digits as its factorization.

2169640475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86785629 (or 86785624 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 2169640475 is about 46579.3996848392. The cubic root of 2169640475 is about 1294.5810872036.

The spelling of 2169640475 in words is "two billion, one hundred sixty-nine million, six hundred forty thousand, four hundred seventy-five".