2189691658 has 16 divisors (see below), whose sum is σ = 4095008064. Its totient is φ = 853126560.

The previous prime is 2189691649. The next prime is 2189691659. The reversal of 2189691658 is 8561969812.

It is a super-2 number, since 2×2189691658² = 9589499114229577928, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2189691599 and 2189691608.

It is not an unprimeable number, because it can be changed into a prime (2189691659) 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, 7109235 + ... + 7109542.

It is an arithmetic number, because the mean of its divisors is an integer number (255938004).

Almost surely, 2^2189691658 is an apocalyptic number.

2189691658 is a deficient number, since it is larger than the sum of its proper divisors (1905316406).

2189691658 is a wasteful number, since it uses less digits than its factorization.

2189691658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14218797.

The product of its digits is 1866240, while the sum is 55.

The square root of 2189691658 is about 46794.1412785832. The cubic root of 2189691658 is about 1298.5569110914.

The spelling of 2189691658 in words is "two billion, one hundred eighty-nine million, six hundred ninety-one thousand, six hundred fifty-eight".