7544664664457 has 4 divisors (see below), whose sum is σ = 7545768822420. Its totient is φ = 7543560506496.

The previous prime is 7544664664441. The next prime is 7544664664463.

7544664664457 is nontrivially palindromic in base 10.

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 346878593296 + 7197786071161 = 588964^2 + 2682869^2 .

It is a cyclic number.

It is not a de Polignac number, because 7544664664457 - 2⁴ = 7544664664441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7544664664057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552068732 + ... + 552082397.

It is an arithmetic number, because the mean of its divisors is an integer number (1886442205605).

Almost surely, 2^{7544664664457} is an apocalyptic number.

It is an amenable number.

7544664664457 is a deficient number, since it is larger than the sum of its proper divisors (1104157963).

7544664664457 is a wasteful number, since it uses less digits than its factorization.

7544664664457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104157962.

The product of its digits is 1625702400, while the sum is 68.

The spelling of 7544664664457 in words is "seven trillion, five hundred forty-four billion, six hundred sixty-four million, six hundred sixty-four thousand, four hundred fifty-seven".