1256442343541 has 12 divisors (see below), whose sum is σ = 1578340796256. Its totient is φ = 979045981320.

The previous prime is 1256442343531. The next prime is 1256442343591. The reversal of 1256442343541 is 1453432446521.

It is not a de Polignac number, because 1256442343541 - 2³⁴ = 1239262474357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1256442343492 and 1256442343501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256442343511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741700655 + ... + 741702348.

It is an arithmetic number, because the mean of its divisors is an integer number (131528399688).

Almost surely, 2^{1256442343541} is an apocalyptic number.

1256442343541 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1256442343541 is a deficient number, since it is larger than the sum of its proper divisors (321898452715).

1256442343541 is a wasteful number, since it uses less digits than its factorization.

1256442343541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483403032 (or 1483403021 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 44.

The spelling of 1256442343541 in words is "one trillion, two hundred fifty-six billion, four hundred forty-two million, three hundred forty-three thousand, five hundred forty-one".