1273262623721 has 6 divisors (see below), whose sum is σ = 1399536603066. Its totient is φ = 1157511476000.

The previous prime is 1273262623673. The next prime is 1273262623727.

1273262623721 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 848498899600 + 424763724121 = 921140^2 + 651739^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1273262623721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1273262623727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5261415680 + ... + 5261415921.

It is an arithmetic number, because the mean of its divisors is an integer number (233256100511).

Almost surely, 2^{1273262623721} is an apocalyptic number.

1273262623721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1273262623721 is a deficient number, since it is larger than the sum of its proper divisors (126273979345).

1273262623721 is a wasteful number, since it uses less digits than its factorization.

1273262623721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10522831623 (or 10522831612 counting only the distinct ones).

The product of its digits is 508032, while the sum is 44.

The spelling of 1273262623721 in words is "one trillion, two hundred seventy-three billion, two hundred sixty-two million, six hundred twenty-three thousand, seven hundred twenty-one".