16405678971 has 24 divisors (see below), whose sum is σ = 26215488000. Its totient is φ = 9802791600.

The previous prime is 16405678921. The next prime is 16405678987. The reversal of 16405678971 is 17987650461.

16405678971 is a `hidden beast` number, since 1 + 6 + 4 + 0 + 567 + 8 + 9 + 71 = 666.

It is not a de Polignac number, because 16405678971 - 2⁶ = 16405678907 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16405678921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1159971 + ... + 1174028.

It is an arithmetic number, because the mean of its divisors is an integer number (1092312000).

Almost surely, 2^16405678971 is an apocalyptic number.

16405678971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16405678971 is a deficient number, since it is larger than the sum of its proper divisors (9809809029).

16405678971 is a wasteful number, since it uses less digits than its factorization.

16405678971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334087 (or 2334084 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 16405678971 in words is "sixteen billion, four hundred five million, six hundred seventy-eight thousand, nine hundred seventy-one".