1952615840809 has 4 divisors (see below), whose sum is σ = 1952665976404. Its totient is φ = 1952565705216.

The previous prime is 1952615840779. The next prime is 1952615840867. The reversal of 1952615840809 is 9080485162591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50897616025 + 1901718224784 = 225605^2 + 1379028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1952615840809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1952615840869) 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, 25009332 + ... + 25087285.

It is an arithmetic number, because the mean of its divisors is an integer number (488166494101).

Almost surely, 2^{1952615840809} is an apocalyptic number.

It is an amenable number.

1952615840809 is a deficient number, since it is larger than the sum of its proper divisors (50135595).

1952615840809 is an equidigital number, since it uses as much as digits as its factorization.

1952615840809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50135594.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 1952615840809 in words is "one trillion, nine hundred fifty-two billion, six hundred fifteen million, eight hundred forty thousand, eight hundred nine".