8157415447693 has 2 divisors, whose sum is σ = 8157415447694. Its totient is φ = 8157415447692.

The previous prime is 8157415447663. The next prime is 8157415447729. The reversal of 8157415447693 is 3967445147518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4384509342084 + 3772906105609 = 2093922^2 + 1942397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8157415447693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8157415447663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4078707723846 + 4078707723847.

It is an arithmetic number, because the mean of its divisors is an integer number (4078707723847).

Almost surely, 2^{8157415447693} is an apocalyptic number.

It is an amenable number.

8157415447693 is a deficient number, since it is larger than the sum of its proper divisors (1).

8157415447693 is an equidigital number, since it uses as much as digits as its factorization.

8157415447693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101606400, while the sum is 64.

The spelling of 8157415447693 in words is "eight trillion, one hundred fifty-seven billion, four hundred fifteen million, four hundred forty-seven thousand, six hundred ninety-three".