1545673110661 has 2 divisors, whose sum is σ = 1545673110662. Its totient is φ = 1545673110660.

The previous prime is 1545673110643. The next prime is 1545673110727. The reversal of 1545673110661 is 1660113765451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 785759917761 + 759913192900 = 886431^2 + 871730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545673110661 - 2²⁹ = 1545136239749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1545673810661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772836555330 + 772836555331.

It is an arithmetic number, because the mean of its divisors is an integer number (772836555331).

Almost surely, 2^{1545673110661} is an apocalyptic number.

It is an amenable number.

1545673110661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545673110661 is an equidigital number, since it uses as much as digits as its factorization.

1545673110661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 1545673110661 in words is "one trillion, five hundred forty-five billion, six hundred seventy-three million, one hundred ten thousand, six hundred sixty-one".