23451644601661 has 2 divisors, whose sum is σ = 23451644601662. Its totient is φ = 23451644601660.

The previous prime is 23451644601613. The next prime is 23451644601667. The reversal of 23451644601661 is 16610644615432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15622896561561 + 7828748040100 = 3952581^2 + 2797990^2 .

It is a cyclic number.

It is not a de Polignac number, because 23451644601661 - 2⁷ = 23451644601533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23451644601667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11725822300830 + 11725822300831.

It is an arithmetic number, because the mean of its divisors is an integer number (11725822300831).

Almost surely, 2^{23451644601661} is an apocalyptic number.

It is an amenable number.

23451644601661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23451644601661 is an equidigital number, since it uses as much as digits as its factorization.

23451644601661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 23451644601661 in words is "twenty-three trillion, four hundred fifty-one billion, six hundred forty-four million, six hundred one thousand, six hundred sixty-one".