18151903441 has 27 divisors (see below), whose sum is σ = 22307333211. Its totient is φ = 14725340784.

The previous prime is 18151903433. The next prime is 18151903457. The reversal of 18151903441 is 14430915181.

The square root of 18151903441 is 134729.

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

It can be written as a sum of positive squares in only one way, i.e., 35820225 + 18116083216 = 5985^2 + 134596^2 .

It is not a de Polignac number, because 18151903441 - 2³ = 18151903433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18151903441.

It is not an unprimeable number, because it can be changed into a prime (18151903411) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 17918451 + ... + 17919463.

Almost surely, 2^18151903441 is an apocalyptic number.

18151903441 is the 134729-th square number.

18151903441 is the 67365-th centered octagonal number.

It is an amenable number.

18151903441 is a deficient number, since it is larger than the sum of its proper divisors (4155429770).

18151903441 is an frugal number, since it uses more digits than its factorization.

18151903441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 1039 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 18151903441 in words is "eighteen billion, one hundred fifty-one million, nine hundred three thousand, four hundred forty-one".