1822208621261 has 4 divisors (see below), whose sum is σ = 2082524138592. Its totient is φ = 1561893103932.

The previous prime is 1822208621257. The next prime is 1822208621281. The reversal of 1822208621261 is 1621268022281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1822208621261 - 2² = 1822208621257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822208621251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130157758655 + ... + 130157758668.

It is an arithmetic number, because the mean of its divisors is an integer number (520631034648).

Almost surely, 2^{1822208621261} is an apocalyptic number.

It is an amenable number.

1822208621261 is a deficient number, since it is larger than the sum of its proper divisors (260315517331).

1822208621261 is an equidigital number, since it uses as much as digits as its factorization.

1822208621261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260315517330.

The product of its (nonzero) digits is 73728, while the sum is 41.

The spelling of 1822208621261 in words is "one trillion, eight hundred twenty-two billion, two hundred eight million, six hundred twenty-one thousand, two hundred sixty-one".