1263777652645 has 4 divisors (see below), whose sum is σ = 1516533183180. Its totient is φ = 1011022122112.

The previous prime is 1263777652639. The next prime is 1263777652733. The reversal of 1263777652645 is 5462567773621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 427610058561 + 836167594084 = 653919^2 + 914422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263777652645 - 2⁷ = 1263777652517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126377765260 + ... + 126377765269.

It is an arithmetic number, because the mean of its divisors is an integer number (379133295795).

Almost surely, 2^{1263777652645} is an apocalyptic number.

It is an amenable number.

1263777652645 is a deficient number, since it is larger than the sum of its proper divisors (252755530535).

1263777652645 is an equidigital number, since it uses as much as digits as its factorization.

1263777652645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252755530534.

The product of its digits is 88905600, while the sum is 61.

The spelling of 1263777652645 in words is "one trillion, two hundred sixty-three billion, seven hundred seventy-seven million, six hundred fifty-two thousand, six hundred forty-five".