18441911601 has 45 divisors (see below), whose sum is σ = 28049013993. Its totient is φ = 12075424920.

The previous prime is 18441911599. The next prime is 18441911603. The reversal of 18441911601 is 10611914481.

The square root of 18441911601 is 135801.

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

18441911601 is a `hidden beast` number, since 1 + 8 + 4 + 41 + 9 + 1 + 1 + 601 = 666.

It is an interprime number because it is at equal distance from previous prime (18441911599) and next prime (18441911603).

It is not a de Polignac number, because 18441911601 - 2¹ = 18441911599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18441911603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 96554416 + ... + 96554606.

Almost surely, 2^18441911601 is an apocalyptic number.

18441911601 is the 135801-st square number.

18441911601 is the 67901-st centered octagonal number.

It is an amenable number.

18441911601 is a deficient number, since it is larger than the sum of its proper divisors (9607102392).

18441911601 is an frugal number, since it uses more digits than its factorization.

18441911601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

Multiplying 18441911601 by its sum of digits (36), we get a square (663908817636 = 814806²).

The spelling of 18441911601 in words is "eighteen billion, four hundred forty-one million, nine hundred eleven thousand, six hundred one".