1821380486667 has 16 divisors (see below), whose sum is σ = 2776329742080. Its totient is φ = 1040454045792.

The previous prime is 1821380486603. The next prime is 1821380486671. The reversal of 1821380486667 is 7666840831281.

It is not a de Polignac number, because 1821380486667 - 2⁶ = 1821380486603 is a prime.

It is a super-2 number, since 2×1821380486667² (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 1821380486667.

It is not an unprimeable number, because it can be changed into a prime (1821380486687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13883313 + ... + 14013890.

It is an arithmetic number, because the mean of its divisors is an integer number (173520608880).

Almost surely, 2^{1821380486667} is an apocalyptic number.

1821380486667 is a deficient number, since it is larger than the sum of its proper divisors (954949255413).

1821380486667 is a wasteful number, since it uses less digits than its factorization.

1821380486667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27900322.

The product of its (nonzero) digits is 18579456, while the sum is 60.

The spelling of 1821380486667 in words is "one trillion, eight hundred twenty-one billion, three hundred eighty million, four hundred eighty-six thousand, six hundred sixty-seven".