18649249477 has 8 divisors (see below), whose sum is σ = 18793447200. Its totient is φ = 18505552464.

The previous prime is 18649249433. The next prime is 18649249537. The reversal of 18649249477 is 77494294681.

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 18649249477 - 2¹⁵ = 18649216709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18649249277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50227 + ... + 199552.

It is an arithmetic number, because the mean of its divisors is an integer number (2349180900).

Almost surely, 2^18649249477 is an apocalyptic number.

It is an amenable number.

18649249477 is a deficient number, since it is larger than the sum of its proper divisors (144197723).

18649249477 is a wasteful number, since it uses less digits than its factorization.

18649249477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250355.

The product of its digits is 24385536, while the sum is 61.

The spelling of 18649249477 in words is "eighteen billion, six hundred forty-nine million, two hundred forty-nine thousand, four hundred seventy-seven".