1261256544493 has 16 divisors (see below), whose sum is σ = 1397963653632. Its totient is φ = 1128285774000.

The previous prime is 1261256544433. The next prime is 1261256544523. The reversal of 1261256544493 is 3944456521621.

It is not a de Polignac number, because 1261256544493 - 2¹³ = 1261256536301 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 1261256544493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261256544433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1135443 + ... + 1952368.

It is an arithmetic number, because the mean of its divisors is an integer number (87372728352).

Almost surely, 2^{1261256544493} is an apocalyptic number.

It is an amenable number.

1261256544493 is a deficient number, since it is larger than the sum of its proper divisors (136707109139).

1261256544493 is a wasteful number, since it uses less digits than its factorization.

1261256544493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088416.

The product of its digits is 6220800, while the sum is 52.

The spelling of 1261256544493 in words is "one trillion, two hundred sixty-one billion, two hundred fifty-six million, five hundred forty-four thousand, four hundred ninety-three".