816565890157 has 8 divisors (see below), whose sum is σ = 817531957440. Its totient is φ = 815600100000.

The previous prime is 816565890149. The next prime is 816565890167. The reversal of 816565890157 is 751098565618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816565890157 - 2³ = 816565890149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816565890095 and 816565890104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816565890167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6155782 + ... + 6287032.

It is an arithmetic number, because the mean of its divisors is an integer number (102191494680).

Almost surely, 2^816565890157 is an apocalyptic number.

It is an amenable number.

816565890157 is a deficient number, since it is larger than the sum of its proper divisors (966067283).

816565890157 is a wasteful number, since it uses less digits than its factorization.

816565890157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138563.

The product of its (nonzero) digits is 18144000, while the sum is 61.

The spelling of 816565890157 in words is "eight hundred sixteen billion, five hundred sixty-five million, eight hundred ninety thousand, one hundred fifty-seven".