1275464645721 has 48 divisors (see below), whose sum is σ = 2209125744000. Its totient is φ = 725174293536.

The previous prime is 1275464645641. The next prime is 1275464645747.

1275464645721 is a `hidden beast` number, since 1 + 2 + 7 + 5 + 4 + 6 + 4 + 64 + 572 + 1 = 666.

1275464645721 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1275464645721 - 2⁹ = 1275464645209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1275464645621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2159010 + ... + 2685563.

It is an arithmetic number, because the mean of its divisors is an integer number (46023453000).

Almost surely, 2^{1275464645721} is an apocalyptic number.

It is an amenable number.

1275464645721 is a deficient number, since it is larger than the sum of its proper divisors (933661098279).

1275464645721 is a wasteful number, since it uses less digits than its factorization.

1275464645721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4844795 (or 4844782 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 1275464645721 in words is "one trillion, two hundred seventy-five billion, four hundred sixty-four million, six hundred forty-five thousand, seven hundred twenty-one".