1165205426564 has 6 divisors (see below), whose sum is σ = 2039109496494. Its totient is φ = 582602713280.

The previous prime is 1165205426533. The next prime is 1165205426599. The reversal of 1165205426564 is 4656245025611.

It can be written as a sum of positive squares in only one way, i.e., 1073590244164 + 91615182400 = 1036142^2 + 302680^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145650678317 + ... + 145650678324.

It is an arithmetic number, because the mean of its divisors is an integer number (339851582749).

Almost surely, 2^{1165205426564} is an apocalyptic number.

It is an amenable number.

1165205426564 is a deficient number, since it is larger than the sum of its proper divisors (873904069930).

1165205426564 is a wasteful number, since it uses less digits than its factorization.

1165205426564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291301356645 (or 291301356643 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 1165205426564 in words is "one trillion, one hundred sixty-five billion, two hundred five million, four hundred twenty-six thousand, five hundred sixty-four".