1819457640004 has 12 divisors (see below), whose sum is σ = 3189767302764. Its totient is φ = 908095553504.

The previous prime is 1819457639981. The next prime is 1819457640019. The reversal of 1819457640004 is 4000467549181.

It can be written as a sum of positive squares in 2 ways, for example, as 583158267904 + 1236299372100 = 763648^2 + 1111890^2 .

It is a super-2 number, since 2×1819457640004² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1819457640004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408314119 + ... + 408318574.

It is an arithmetic number, because the mean of its divisors is an integer number (265813941897).

Almost surely, 2^{1819457640004} is an apocalyptic number.

It is an amenable number.

1819457640004 is a deficient number, since it is larger than the sum of its proper divisors (1370309662760).

1819457640004 is a wasteful number, since it uses less digits than its factorization.

1819457640004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816633254 (or 816633252 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 1819457640004 in words is "one trillion, eight hundred nineteen billion, four hundred fifty-seven million, six hundred forty thousand, four".