7545444661 has 2 divisors, whose sum is σ = 7545444662. Its totient is φ = 7545444660.

The previous prime is 7545444617. The next prime is 7545444677. The reversal of 7545444661 is 1664445457.

It is a happy number.

7545444661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5444964100 + 2100480561 = 73790^2 + 45831^2 .

It is an emirp because it is prime and its reverse (1664445457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7545444661 - 2²³ = 7537056053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7545448661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3772722330 + 3772722331.

It is an arithmetic number, because the mean of its divisors is an integer number (3772722331).

Almost surely, 2^7545444661 is an apocalyptic number.

It is an amenable number.

7545444661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7545444661 is an equidigital number, since it uses as much as digits as its factorization.

7545444661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 46.

The square root of 7545444661 is about 86864.5189994166. The cubic root of 7545444661 is about 1961.3794139605.

The spelling of 7545444661 in words is "seven billion, five hundred forty-five million, four hundred forty-four thousand, six hundred sixty-one".