1575946820447 has 4 divisors (see below), whose sum is σ = 1583415762936. Its totient is φ = 1568477877960.

The previous prime is 1575946820423. The next prime is 1575946820449. The reversal of 1575946820447 is 7440286495751.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1575946820447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1575946820447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1575946820449) 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, 3734470928 + ... + 3734471349.

It is an arithmetic number, because the mean of its divisors is an integer number (395853940734).

Almost surely, 2^{1575946820447} is an apocalyptic number.

1575946820447 is a deficient number, since it is larger than the sum of its proper divisors (7468942489).

1575946820447 is an equidigital number, since it uses as much as digits as its factorization.

1575946820447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468942488.

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 1575946820447 in words is "one trillion, five hundred seventy-five billion, nine hundred forty-six million, eight hundred twenty thousand, four hundred forty-seven".