1273521012746 has 4 divisors (see below), whose sum is σ = 1910281519122. Its totient is φ = 636760506372.

The previous prime is 1273521012739. The next prime is 1273521012769. The reversal of 1273521012746 is 6472101253721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1257849728521 + 15671284225 = 1121539^2 + 125185^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318380253185 + ... + 318380253188.

Almost surely, 2^{1273521012746} is an apocalyptic number.

1273521012746 is a deficient number, since it is larger than the sum of its proper divisors (636760506376).

1273521012746 is an equidigital number, since it uses as much as digits as its factorization.

1273521012746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636760506375.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 1273521012746 in words is "one trillion, two hundred seventy-three billion, five hundred twenty-one million, twelve thousand, seven hundred forty-six".