1268905661544 has 16 divisors (see below), whose sum is σ = 3172264153920. Its totient is φ = 422968553840.

The previous prime is 1268905661539. The next prime is 1268905661561. The reversal of 1268905661544 is 4451665098621.

It is a super-2 number, since 2×1268905661544² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26435534592 + ... + 26435534639.

It is an arithmetic number, because the mean of its divisors is an integer number (198266509620).

Almost surely, 2^{1268905661544} is an apocalyptic number.

It is an amenable number.

1268905661544 is an abundant number, since it is smaller than the sum of its proper divisors (1903358492376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1268905661544 is a wasteful number, since it uses less digits than its factorization.

1268905661544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52871069240 (or 52871069236 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 57.

The spelling of 1268905661544 in words is "one trillion, two hundred sixty-eight billion, nine hundred five million, six hundred sixty-one thousand, five hundred forty-four".