1955946413821 has 4 divisors (see below), whose sum is σ = 2040987562272. Its totient is φ = 1870905265372.

The previous prime is 1955946413797. The next prime is 1955946413831. The reversal of 1955946413821 is 1283146495591.

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 1955946413821 - 2⁵ = 1955946413789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955946413831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42520574191 + ... + 42520574236.

It is an arithmetic number, because the mean of its divisors is an integer number (510246890568).

Almost surely, 2^{1955946413821} is an apocalyptic number.

It is an amenable number.

1955946413821 is a deficient number, since it is larger than the sum of its proper divisors (85041148451).

1955946413821 is an equidigital number, since it uses as much as digits as its factorization.

1955946413821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85041148450.

The product of its digits is 9331200, while the sum is 58.

The spelling of 1955946413821 in words is "one trillion, nine hundred fifty-five billion, nine hundred forty-six million, four hundred thirteen thousand, eight hundred twenty-one".