1820004666564 has 24 divisors (see below), whose sum is σ = 4853345777728. Its totient is φ = 520001333280.

The previous prime is 1820004666551. The next prime is 1820004666577. The reversal of 1820004666564 is 4656664000281.

It is an interprime number because it is at equal distance from previous prime (1820004666551) and next prime (1820004666577).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10833361027 + ... + 10833361194.

Almost surely, 2^{1820004666564} is an apocalyptic number.

1820004666564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1820004666564 is an abundant number, since it is smaller than the sum of its proper divisors (3033341111164).

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

1820004666564 is a wasteful number, since it uses less digits than its factorization.

1820004666564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21666722235 (or 21666722233 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 1820004666564 in words is "one trillion, eight hundred twenty billion, four million, six hundred sixty-six thousand, five hundred sixty-four".