16405172387 has 8 divisors (see below), whose sum is σ = 16761266496. Its totient is φ = 16049372032.

The previous prime is 16405172383. The next prime is 16405172401. The reversal of 16405172387 is 78327150461.

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 16405172387 - 2² = 16405172383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16405172383) 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, 41393 + ... + 185805.

It is an arithmetic number, because the mean of its divisors is an integer number (2095158312).

Almost surely, 2^16405172387 is an apocalyptic number.

16405172387 is a deficient number, since it is larger than the sum of its proper divisors (356094109).

16405172387 is a wasteful number, since it uses less digits than its factorization.

16405172387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146877.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 16405172387 in words is "sixteen billion, four hundred five million, one hundred seventy-two thousand, three hundred eighty-seven".