1820445442761 has 8 divisors (see below), whose sum is σ = 2647920644064. Its totient is φ = 1103300268320.

The previous prime is 1820445442597. The next prime is 1820445442769. The reversal of 1820445442761 is 1672445440281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1820445442761 - 2¹⁹ = 1820444918473 is a prime.

It is a super-2 number, since 2×1820445442761² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820445442761.

It is not an unprimeable number, because it can be changed into a prime (1820445442769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27582506676 + ... + 27582506741.

It is an arithmetic number, because the mean of its divisors is an integer number (330990080508).

Almost surely, 2^{1820445442761} is an apocalyptic number.

1820445442761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1820445442761 is a deficient number, since it is larger than the sum of its proper divisors (827475201303).

1820445442761 is a wasteful number, since it uses less digits than its factorization.

1820445442761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55165013431.

The product of its (nonzero) digits is 1720320, while the sum is 48.

The spelling of 1820445442761 in words is "one trillion, eight hundred twenty billion, four hundred forty-five million, four hundred forty-two thousand, seven hundred sixty-one".