1955220673 has 4 divisors (see below), whose sum is σ = 2234537920. Its totient is φ = 1675903428.

The previous prime is 1955220667. The next prime is 1955220703. The reversal of 1955220673 is 3760225591.

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 a cyclic number.

It is not a de Polignac number, because 1955220673 - 2⁹ = 1955220161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1955220653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139658613 + ... + 139658626.

It is an arithmetic number, because the mean of its divisors is an integer number (558634480).

Almost surely, 2^1955220673 is an apocalyptic number.

It is an amenable number.

1955220673 is a deficient number, since it is larger than the sum of its proper divisors (279317247).

1955220673 is an equidigital number, since it uses as much as digits as its factorization.

1955220673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279317246.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 1955220673 is about 44217.8773009289. The cubic root of 1955220673 is about 1250.4469170997.

The spelling of 1955220673 in words is "one billion, nine hundred fifty-five million, two hundred twenty thousand, six hundred seventy-three".