1263438487558 has 64 divisors (see below), whose sum is σ = 2071151208000. Its totient is φ = 577988566272.

The previous prime is 1263438487543. The next prime is 1263438487583. The reversal of 1263438487558 is 8557848343621.

It is a self number, because there is not a number n which added to its sum of digits gives 1263438487558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494108416 + ... + 494110972.

It is an arithmetic number, because the mean of its divisors is an integer number (32361737625).

Almost surely, 2^{1263438487558} is an apocalyptic number.

1263438487558 is a deficient number, since it is larger than the sum of its proper divisors (807712720442).

1263438487558 is a wasteful number, since it uses less digits than its factorization.

1263438487558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3546 (or 3520 counting only the distinct ones).

The product of its digits is 154828800, while the sum is 64.

The spelling of 1263438487558 in words is "one trillion, two hundred sixty-three billion, four hundred thirty-eight million, four hundred eighty-seven thousand, five hundred fifty-eight".