64991169 has 24 divisors (see below), whose sum is σ = 99582912. Its totient is φ = 40756320.

The previous prime is 64991161. The next prime is 64991219. The reversal of 64991169 is 96119946.

It is not a de Polignac number, because 64991169 - 2³ = 64991161 is a prime.

It is a super-2 number, since 2×64991169² = 8447704095973122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64991161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10054 + ... + 15200.

It is an arithmetic number, because the mean of its divisors is an integer number (4149288).

Almost surely, 2^64991169 is an apocalyptic number.

64991169 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

64991169 is a deficient number, since it is larger than the sum of its proper divisors (34591743).

64991169 is a wasteful number, since it uses less digits than its factorization.

64991169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5237 (or 5234 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 64991169 is about 8061.7100543247. The cubic root of 64991169 is about 402.0543663013.

The spelling of 64991169 in words is "sixty-four million, nine hundred ninety-one thousand, one hundred sixty-nine".