16712131781 has 2 divisors, whose sum is σ = 16712131782. Its totient is φ = 16712131780.

The previous prime is 16712131763. The next prime is 16712131819. The reversal of 16712131781 is 18713121761.

It is an a-pointer prime, because the next prime (16712131819) can be obtained adding 16712131781 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16688764225 + 23367556 = 129185^2 + 4834^2 .

It is a cyclic number.

It is not a de Polignac number, because 16712131781 - 2⁶ = 16712131717 is a prime.

It is a super-2 number, since 2×16712131781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16712131181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8356065890 + 8356065891.

It is an arithmetic number, because the mean of its divisors is an integer number (8356065891).

Almost surely, 2^16712131781 is an apocalyptic number.

It is an amenable number.

16712131781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16712131781 is an equidigital number, since it uses as much as digits as its factorization.

16712131781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 38.

The spelling of 16712131781 in words is "sixteen billion, seven hundred twelve million, one hundred thirty-one thousand, seven hundred eighty-one".