1820257772124 has 24 divisors (see below), whose sum is σ = 4633383420288. Its totient is φ = 551593264240.

The previous prime is 1820257772071. The next prime is 1820257772147. The reversal of 1820257772124 is 4212777520281.

It is a super-2 number, since 2×1820257772124² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6894915672 + ... + 6894915935.

It is an arithmetic number, because the mean of its divisors is an integer number (193057642512).

Almost surely, 2^{1820257772124} is an apocalyptic number.

It is an amenable number.

1820257772124 is an abundant number, since it is smaller than the sum of its proper divisors (2813125648164).

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

1820257772124 is a wasteful number, since it uses less digits than its factorization.

1820257772124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13789831625 (or 13789831623 counting only the distinct ones).

The product of its (nonzero) digits is 878080, while the sum is 48.

The spelling of 1820257772124 in words is "one trillion, eight hundred twenty billion, two hundred fifty-seven million, seven hundred seventy-two thousand, one hundred twenty-four".