1261274065744 has 120 divisors (see below), whose sum is σ = 3143602243008. Its totient is φ = 484673656320.

The previous prime is 1261274065729. The next prime is 1261274065747. The reversal of 1261274065744 is 4475604721621.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261274065747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 372172 + ... + 1631275.

Almost surely, 2^{1261274065744} is an apocalyptic number.

1261274065744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1261274065744 is an abundant number, since it is smaller than the sum of its proper divisors (1882328177264).

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

1261274065744 is a wasteful number, since it uses less digits than its factorization.

1261274065744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003553 (or 2003540 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 49.

The spelling of 1261274065744 in words is "one trillion, two hundred sixty-one billion, two hundred seventy-four million, sixty-five thousand, seven hundred forty-four".