1243257734456 has 8 divisors (see below), whose sum is σ = 2331108252120. Its totient is φ = 621628867224.

The previous prime is 1243257734447. The next prime is 1243257734471. The reversal of 1243257734456 is 6544377523421.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1243257734398 and 1243257734407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77703608396 + ... + 77703608411.

It is an arithmetic number, because the mean of its divisors is an integer number (291388531515).

Almost surely, 2^{1243257734456} is an apocalyptic number.

It is an amenable number.

1243257734456 is a deficient number, since it is larger than the sum of its proper divisors (1087850517664).

1243257734456 is a wasteful number, since it uses less digits than its factorization.

1243257734456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155407216813 (or 155407216809 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 53.

The spelling of 1243257734456 in words is "one trillion, two hundred forty-three billion, two hundred fifty-seven million, seven hundred thirty-four thousand, four hundred fifty-six".