1601026865 has 8 divisors (see below), whose sum is σ = 1929205608. Its totient is φ = 1275505920.

The previous prime is 1601026859. The next prime is 1601026879. The reversal of 1601026865 is 5686201061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 122855056 + 1478171809 = 11084^2 + 38447^2 .

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

It is not a de Polignac number, because 1601026865 - 2¹⁸ = 1600764721 is a prime.

It is a Duffinian 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, 663122 + ... + 665531.

It is an arithmetic number, because the mean of its divisors is an integer number (241150701).

Almost surely, 2^1601026865 is an apocalyptic number.

It is an amenable number.

1601026865 is a deficient number, since it is larger than the sum of its proper divisors (328178743).

1601026865 is a wasteful number, since it uses less digits than its factorization.

1601026865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328899.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1601026865 is about 40012.8337536846. The cubic root of 1601026865 is about 1169.8572560654.

It can be divided in two parts, 16010 and 26865, that added together give a cube (42875 = 35³).

The spelling of 1601026865 in words is "one billion, six hundred one million, twenty-six thousand, eight hundred sixty-five".