18061457647 has 8 divisors (see below), whose sum is σ = 18190382112. Its totient is φ = 17932780800.

The previous prime is 18061457639. The next prime is 18061457663. The reversal of 18061457647 is 74675416081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18061457647 - 2³ = 18061457639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18061457647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061451647) 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, 85747 + ... + 208507.

It is an arithmetic number, because the mean of its divisors is an integer number (2273797764).

Almost surely, 2^18061457647 is an apocalyptic number.

18061457647 is a deficient number, since it is larger than the sum of its proper divisors (128924465).

18061457647 is a wasteful number, since it uses less digits than its factorization.

18061457647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123809.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 18061457647 in words is "eighteen billion, sixty-one million, four hundred fifty-seven thousand, six hundred forty-seven".