16342630781 has 2 divisors, whose sum is σ = 16342630782. Its totient is φ = 16342630780.

The previous prime is 16342630753. The next prime is 16342630789. The reversal of 16342630781 is 18703624361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16298607556 + 44023225 = 127666^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 16342630781 - 2¹⁰ = 16342629757 is a prime.

It is a super-2 number, since 2×16342630781² (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 (16342630789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8171315390 + 8171315391.

It is an arithmetic number, because the mean of its divisors is an integer number (8171315391).

Almost surely, 2^16342630781 is an apocalyptic number.

It is an amenable number.

16342630781 is a deficient number, since it is larger than the sum of its proper divisors (1).

16342630781 is an equidigital number, since it uses as much as digits as its factorization.

16342630781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 16342630781 in words is "sixteen billion, three hundred forty-two million, six hundred thirty thousand, seven hundred eighty-one".