816470857546825 has 12 divisors (see below), whose sum is σ = 1090302622078348. Its totient is φ = 602932325572800.

The previous prime is 816470857546763. The next prime is 816470857546871. The reversal of 816470857546825 is 528645758074618.

It can be written as a sum of positive squares in 6 ways, for example, as 32733811494409 + 783737046052416 = 5721347^2 + 27995304^2 .

It is not a de Polignac number, because 816470857546825 - 2¹⁷ = 816470857415753 is a prime.

It is a super-2 number, since 2×816470857546825² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1256109011286 + ... + 1256109011935.

Almost surely, 2^{816470857546825} is an apocalyptic number.

It is an amenable number.

816470857546825 is a deficient number, since it is larger than the sum of its proper divisors (273831764531523).

816470857546825 is a wasteful number, since it uses less digits than its factorization.

816470857546825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512218023244 (or 2512218023239 counting only the distinct ones).

The product of its (nonzero) digits is 3612672000, while the sum is 76.

The spelling of 816470857546825 in words is "eight hundred sixteen trillion, four hundred seventy billion, eight hundred fifty-seven million, five hundred forty-six thousand, eight hundred twenty-five".