1955671865629 has 6 divisors (see below), whose sum is σ = 2064019337790. Its totient is φ = 1852741767096.

The previous prime is 1955671865611. The next prime is 1955671865633. The reversal of 1955671865629 is 9265681765591.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1737954439225 + 217717426404 = 1318315^2 + 466602^2 .

It is not a de Polignac number, because 1955671865629 - 2⁷ = 1955671865501 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 (1955671865699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2708686434 + ... + 2708687155.

It is an arithmetic number, because the mean of its divisors is an integer number (344003222965).

Almost surely, 2^{1955671865629} is an apocalyptic number.

1955671865629 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1955671865629 is a deficient number, since it is larger than the sum of its proper divisors (108347472161).

1955671865629 is an equidigital number, since it uses as much as digits as its factorization.

1955671865629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5417373627 (or 5417373608 counting only the distinct ones).

The product of its digits is 244944000, while the sum is 70.

The spelling of 1955671865629 in words is "one trillion, nine hundred fifty-five billion, six hundred seventy-one million, eight hundred sixty-five thousand, six hundred twenty-nine".