1691568955 has 16 divisors (see below), whose sum is σ = 2137802400. Its totient is φ = 1281381120.

The previous prime is 1691568943. The next prime is 1691568961. The reversal of 1691568955 is 5598651961.

It is not a de Polignac number, because 1691568955 - 2¹¹ = 1691566907 is a prime.

It is a super-2 number, since 2×1691568955² = 5722811059039584050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1691568896 and 1691568905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273295 + ... + 279415.

It is an arithmetic number, because the mean of its divisors is an integer number (133612650).

Almost surely, 2^1691568955 is an apocalyptic number.

1691568955 is a deficient number, since it is larger than the sum of its proper divisors (446233445).

1691568955 is a wasteful number, since it uses less digits than its factorization.

1691568955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9054.

The product of its digits is 2916000, while the sum is 55.

The square root of 1691568955 is about 41128.6877373932. The cubic root of 1691568955 is about 1191.5069191918.

The spelling of 1691568955 in words is "one billion, six hundred ninety-one million, five hundred sixty-eight thousand, nine hundred fifty-five".