1273220165723 has 8 divisors (see below), whose sum is σ = 1388977190256. Its totient is φ = 1157464764000.

The previous prime is 1273220165681. The next prime is 1273220165839. The reversal of 1273220165723 is 3275610223721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1273220165723 - 2³⁸ = 998342258779 is a prime.

It is a super-2 number, since 2×1273220165723² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273220165923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718273 + ... + 2344973.

It is an arithmetic number, because the mean of its divisors is an integer number (173622148782).

Almost surely, 2^{1273220165723} is an apocalyptic number.

1273220165723 is a deficient number, since it is larger than the sum of its proper divisors (115757024533).

1273220165723 is a wasteful number, since it uses less digits than its factorization.

1273220165723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811405.

The product of its (nonzero) digits is 211680, while the sum is 41.

The spelling of 1273220165723 in words is "one trillion, two hundred seventy-three billion, two hundred twenty million, one hundred sixty-five thousand, seven hundred twenty-three".