18648401387 has 16 divisors (see below), whose sum is σ = 23266317312. Its totient is φ = 14520995520.

The previous prime is 18648401381. The next prime is 18648401399. The reversal of 18648401387 is 78310484681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18648401387 - 2⁸ = 18648401131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18648401381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25838 + ... + 194844.

It is an arithmetic number, because the mean of its divisors is an integer number (1454144832).

Almost surely, 2^18648401387 is an apocalyptic number.

18648401387 is a deficient number, since it is larger than the sum of its proper divisors (4617915925).

18648401387 is a wasteful number, since it uses less digits than its factorization.

18648401387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170458.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The spelling of 18648401387 in words is "eighteen billion, six hundred forty-eight million, four hundred one thousand, three hundred eighty-seven".