15940706895397 has 2 divisors, whose sum is σ = 15940706895398. Its totient is φ = 15940706895396.

The previous prime is 15940706895301. The next prime is 15940706895439. The reversal of 15940706895397 is 79359860704951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11465002772001 + 4475704123396 = 3386001^2 + 2115586^2 .

It is an emirp because it is prime and its reverse (79359860704951) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15940706895397 is a prime.

It is a super-2 number, since 2×15940706895397² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15940706898397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7970353447698 + 7970353447699.

It is an arithmetic number, because the mean of its divisors is an integer number (7970353447699).

Almost surely, 2^{15940706895397} is an apocalyptic number.

It is an amenable number.

15940706895397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15940706895397 is an equidigital number, since it uses as much as digits as its factorization.

15940706895397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 514382400, while the sum is 73.

The spelling of 15940706895397 in words is "fifteen trillion, nine hundred forty billion, seven hundred six million, eight hundred ninety-five thousand, three hundred ninety-seven".