8420815403391 has 16 divisors (see below), whose sum is σ = 11607473512448. Its totient is φ = 5424565053600.

The previous prime is 8420815403369. The next prime is 8420815403419. The reversal of 8420815403391 is 1933045180248.

It is not a de Polignac number, because 8420815403391 - 2²¹ = 8420813306239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8420815403391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420815403311) 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, 68430511 + ... + 68553456.

It is an arithmetic number, because the mean of its divisors is an integer number (725467094528).

Almost surely, 2^{8420815403391} is an apocalyptic number.

8420815403391 is a deficient number, since it is larger than the sum of its proper divisors (3186658109057).

8420815403391 is a wasteful number, since it uses less digits than its factorization.

8420815403391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136984662.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 8420815403391 in words is "eight trillion, four hundred twenty billion, eight hundred fifteen million, four hundred three thousand, three hundred ninety-one".