1856217108552 has 32 divisors (see below), whose sum is σ = 4704111854880. Its totient is φ = 610263158400.

The previous prime is 1856217108541. The next prime is 1856217108553. The reversal of 1856217108552 is 2558017126581.

It is a super-2 number, since 2×1856217108552² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1856217108495 and 1856217108504.

It is not an unprimeable number, because it can be changed into a prime (1856217108553) 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, 529740574 + ... + 529744077.

It is an arithmetic number, because the mean of its divisors is an integer number (147003495465).

Almost surely, 2^{1856217108552} is an apocalyptic number.

1856217108552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1856217108552 is an abundant number, since it is smaller than the sum of its proper divisors (2847894746328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1856217108552 is a wasteful number, since it uses less digits than its factorization.

1856217108552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059484733 (or 1059484729 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 51.

The spelling of 1856217108552 in words is "one trillion, eight hundred fifty-six billion, two hundred seventeen million, one hundred eight thousand, five hundred fifty-two".