16181325638 has 8 divisors (see below), whose sum is σ = 24349535688. Its totient is φ = 8064813744.

The previous prime is 16181325569. The next prime is 16181325691. The reversal of 16181325638 is 83652318161.

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

It is a super-2 number, since 2×16181325638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12923756 + ... + 12925007.

It is an arithmetic number, because the mean of its divisors is an integer number (3043691961).

Almost surely, 2^16181325638 is an apocalyptic number.

16181325638 is a deficient number, since it is larger than the sum of its proper divisors (8168210050).

16181325638 is a wasteful number, since it uses less digits than its factorization.

16181325638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25849078.

The product of its digits is 207360, while the sum is 44.

The spelling of 16181325638 in words is "sixteen billion, one hundred eighty-one million, three hundred twenty-five thousand, six hundred thirty-eight".