43056665001 has 81 divisors (see below), whose sum is σ = 74463481989. Its totient is φ = 23904115200.

The previous prime is 43056664979. The next prime is 43056665009. The reversal of 43056665001 is 10056665034.

The square root of 43056665001 is 207501.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 3757567401 + 39299097600 = 61299^2 + 198240^2 .

It is not a de Polignac number, because 43056665001 - 2⁷ = 43056664873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43056665009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 178658241 + ... + 178658481.

Almost surely, 2^43056665001 is an apocalyptic number.

43056665001 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

43056665001 is the 207501-st square number.

43056665001 is the 103751-st centered octagonal number.

It is an amenable number.

43056665001 is a deficient number, since it is larger than the sum of its proper divisors (31406816988).

43056665001 is an equidigital number, since it uses as much as digits as its factorization.

43056665001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Multiplying 43056665001 by its sum of digits (36), we get a square (1550039940036 = 1245006²).

The spelling of 43056665001 in words is "forty-three billion, fifty-six million, six hundred sixty-five thousand, one".