16345415861 has 2 divisors, whose sum is σ = 16345415862. Its totient is φ = 16345415860.

The previous prime is 16345415831. The next prime is 16345415881. The reversal of 16345415861 is 16851454361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13696254961 + 2649160900 = 117031^2 + 51470^2 .

It is a cyclic number.

It is not a de Polignac number, because 16345415861 - 2¹⁸ = 16345153717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16345415831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8172707930 + 8172707931.

It is an arithmetic number, because the mean of its divisors is an integer number (8172707931).

Almost surely, 2^16345415861 is an apocalyptic number.

It is an amenable number.

16345415861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16345415861 is an equidigital number, since it uses as much as digits as its factorization.

16345415861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The spelling of 16345415861 in words is "sixteen billion, three hundred forty-five million, four hundred fifteen thousand, eight hundred sixty-one".