16193086381561 has 16 divisors (see below), whose sum is σ = 17235717570000. Its totient is φ = 15160477483008.

The previous prime is 16193086381543. The next prime is 16193086381583. The reversal of 16193086381561 is 16518368039161.

It can be written as a sum of positive squares in 8 ways, for example, as 3504309120400 + 12688777261161 = 1871980^2 + 3562131^2 .

It is a cyclic number.

It is not a de Polignac number, because 16193086381561 - 2¹⁷ = 16193086250489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16193086381496 and 16193086381505.

It is not an unprimeable number, because it can be changed into a prime (16193083381561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46577785 + ... + 46924153.

It is an arithmetic number, because the mean of its divisors is an integer number (1077232348125).

Almost surely, 2^{16193086381561} is an apocalyptic number.

It is an amenable number.

16193086381561 is a deficient number, since it is larger than the sum of its proper divisors (1042631188439).

16193086381561 is a wasteful number, since it uses less digits than its factorization.

16193086381561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360828.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 16193086381561 in words is "sixteen trillion, one hundred ninety-three billion, eighty-six million, three hundred eighty-one thousand, five hundred sixty-one".