1867121798399 has 32 divisors (see below), whose sum is σ = 2197977223680. Its totient is φ = 1563649718400.

The previous prime is 1867121798393. The next prime is 1867121798431. The reversal of 1867121798399 is 9938971217681.

It is a de Polignac number, because none of the positive numbers 2^k-1867121798399 is a prime.

It is a super-2 number, since 2×1867121798399² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1867121798393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287644544 + ... + 287651034.

It is an arithmetic number, because the mean of its divisors is an integer number (68686788240).

Almost surely, 2^{1867121798399} is an apocalyptic number.

1867121798399 is a deficient number, since it is larger than the sum of its proper divisors (330855425281).

1867121798399 is a wasteful number, since it uses less digits than its factorization.

1867121798399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271.

The product of its digits is 82301184, while the sum is 71.

The spelling of 1867121798399 in words is "one trillion, eight hundred sixty-seven billion, one hundred twenty-one million, seven hundred ninety-eight thousand, three hundred ninety-nine".