16386241781 has 16 divisors (see below), whose sum is σ = 20171217024. Its totient is φ = 12962666304.

The previous prime is 16386241721. The next prime is 16386241783. The reversal of 16386241781 is 18714268361.

It is not a de Polignac number, because 16386241781 - 2²² = 16382047477 is a prime.

It is a super-2 number, since 2×16386241781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16386241783) 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, 668366 + ... + 692448.

It is an arithmetic number, because the mean of its divisors is an integer number (1260701064).

Almost surely, 2^16386241781 is an apocalyptic number.

It is an amenable number.

16386241781 is a deficient number, since it is larger than the sum of its proper divisors (3784975243).

16386241781 is a wasteful number, since it uses less digits than its factorization.

16386241781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31580.

The product of its digits is 387072, while the sum is 47.

The spelling of 16386241781 in words is "sixteen billion, three hundred eighty-six million, two hundred forty-one thousand, seven hundred eighty-one".