16491195157 has 2 divisors, whose sum is σ = 16491195158. Its totient is φ = 16491195156.

The previous prime is 16491195131. The next prime is 16491195169. The reversal of 16491195157 is 75159119461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16353038641 + 138156516 = 127879^2 + 11754^2 .

It is a cyclic number.

It is not a de Polignac number, because 16491195157 - 2³¹ = 14343711509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16491195157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16491195557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8245597578 + 8245597579.

It is an arithmetic number, because the mean of its divisors is an integer number (8245597579).

Almost surely, 2^16491195157 is an apocalyptic number.

It is an amenable number.

16491195157 is a deficient number, since it is larger than the sum of its proper divisors (1).

16491195157 is an equidigital number, since it uses as much as digits as its factorization.

16491195157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 49.

The spelling of 16491195157 in words is "sixteen billion, four hundred ninety-one million, one hundred ninety-five thousand, one hundred fifty-seven".