1273563709440 has 672 divisors, whose sum is σ = 4718287760256. Its totient is φ = 289910292480.

The previous prime is 1273563709409. The next prime is 1273563709441. The reversal of 1273563709440 is 449073653721.

It is a super-2 number, since 2×1273563709440² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273563709441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2941255464 + ... + 2941255896.

It is an arithmetic number, because the mean of its divisors is an integer number (7021261548).

Almost surely, 2^{1273563709440} is an apocalyptic number.

1273563709440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1273563709440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2359143880128).

1273563709440 is an abundant number, since it is smaller than the sum of its proper divisors (3444724050816).

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

1273563709440 is an frugal number, since it uses more digits than its factorization.

1273563709440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 1273563709440 in words is "one trillion, two hundred seventy-three billion, five hundred sixty-three million, seven hundred nine thousand, four hundred forty".