1261294423615 has 16 divisors (see below), whose sum is σ = 1529232005952. Its totient is φ = 998584095744.

The previous prime is 1261294423583. The next prime is 1261294423639. The reversal of 1261294423615 is 5163244921621.

It is a cyclic number.

It is not a de Polignac number, because 1261294423615 - 2⁵ = 1261294423583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12290697 + ... + 12392893.

It is an arithmetic number, because the mean of its divisors is an integer number (95577000372).

Almost surely, 2^{1261294423615} is an apocalyptic number.

1261294423615 is a deficient number, since it is larger than the sum of its proper divisors (267937582337).

1261294423615 is a wasteful number, since it uses less digits than its factorization.

1261294423615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127746.

The product of its digits is 622080, while the sum is 46.

The spelling of 1261294423615 in words is "one trillion, two hundred sixty-one billion, two hundred ninety-four million, four hundred twenty-three thousand, six hundred fifteen".