17990265385 has 8 divisors (see below), whose sum is σ = 22858219656. Its totient is φ = 13545611520.

The previous prime is 17990265383. The next prime is 17990265389. The reversal of 17990265385 is 58356209971.

It can be written as a sum of positive squares in 4 ways, for example, as 842624784 + 17147640601 = 29028^2 + 130949^2 .

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

It is not a de Polignac number, because 17990265385 - 2¹ = 17990265383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17990265383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105825006 + ... + 105825175.

It is an arithmetic number, because the mean of its divisors is an integer number (2857277457).

Almost surely, 2^17990265385 is an apocalyptic number.

It is an amenable number.

17990265385 is a deficient number, since it is larger than the sum of its proper divisors (4867954271).

17990265385 is a wasteful number, since it uses less digits than its factorization.

17990265385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211650203.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 17990265385 in words is "seventeen billion, nine hundred ninety million, two hundred sixty-five thousand, three hundred eighty-five".