1165400566 has 8 divisors (see below), whose sum is σ = 1907019144. Its totient is φ = 529727520.

The previous prime is 1165400563. The next prime is 1165400597. The reversal of 1165400566 is 6650045611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165400563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26486355 + ... + 26486398.

It is an arithmetic number, because the mean of its divisors is an integer number (238377393).

Almost surely, 2^1165400566 is an apocalyptic number.

1165400566 is a deficient number, since it is larger than the sum of its proper divisors (741618578).

1165400566 is a wasteful number, since it uses less digits than its factorization.

1165400566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52972766.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1165400566 is about 34137.9637061146. The cubic root of 1165400566 is about 1052.3456452401.

The spelling of 1165400566 in words is "one billion, one hundred sixty-five million, four hundred thousand, five hundred sixty-six".