1279481017745 has 48 divisors (see below), whose sum is σ = 1802838649680. Its totient is φ = 869120372736.

The previous prime is 1279481017723. The next prime is 1279481017757. The reversal of 1279481017745 is 5477101849721.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 80388126784 + 1199092890961 = 283528^2 + 1095031^2 .

It is not a de Polignac number, because 1279481017745 - 2⁸ = 1279481017489 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55164611 + ... + 55187799.

It is an arithmetic number, because the mean of its divisors is an integer number (37559138535).

Almost surely, 2^{1279481017745} is an apocalyptic number.

It is an amenable number.

1279481017745 is a deficient number, since it is larger than the sum of its proper divisors (523357631935).

1279481017745 is a wasteful number, since it uses less digits than its factorization.

1279481017745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25314 (or 25307 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 56.

The spelling of 1279481017745 in words is "one trillion, two hundred seventy-nine billion, four hundred eighty-one million, seventeen thousand, seven hundred forty-five".