6565991038 has 16 divisors (see below), whose sum is σ = 10123255296. Its totient is φ = 3192257880.

The previous prime is 6565991023. The next prime is 6565991041. The reversal of 6565991038 is 8301995656.

It is a super-2 number, since 2×6565991038² = 86224476622192634888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152008 + ... + 190363.

It is an arithmetic number, because the mean of its divisors is an integer number (632703456).

Almost surely, 2^6565991038 is an apocalyptic number.

6565991038 is a deficient number, since it is larger than the sum of its proper divisors (3557264258).

6565991038 is a wasteful number, since it uses less digits than its factorization.

6565991038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342639.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The square root of 6565991038 is about 81030.8030195925. The cubic root of 6565991038 is about 1872.5500244686.

The spelling of 6565991038 in words is "six billion, five hundred sixty-five million, nine hundred ninety-one thousand, thirty-eight".