816230815777 has 8 divisors (see below), whose sum is σ = 879641680680. Its totient is φ = 752909076480.

The previous prime is 816230815769. The next prime is 816230815801. The reversal of 816230815777 is 777518032618.

It can be written as a sum of positive squares in 4 ways, for example, as 61862135841 + 754368679936 = 248721^2 + 868544^2 .

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 816230815777 - 2³ = 816230815769 is a prime.

It is a super-2 number, since 2×816230815777² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816230815177) 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, 22262374 + ... + 22299007.

It is an arithmetic number, because the mean of its divisors is an integer number (109955210085).

Almost surely, 2^816230815777 is an apocalyptic number.

It is an amenable number.

816230815777 is a deficient number, since it is larger than the sum of its proper divisors (63410864903).

816230815777 is a wasteful number, since it uses less digits than its factorization.

816230815777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44562803.

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 816230815777 in words is "eight hundred sixteen billion, two hundred thirty million, eight hundred fifteen thousand, seven hundred seventy-seven".