23173130637661 has 4 divisors (see below), whose sum is σ = 23173786819612. Its totient is φ = 23172474455712.

The previous prime is 23173130637649. The next prime is 23173130637677. The reversal of 23173130637661 is 16673603137132.

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 14391924481561 + 8781206156100 = 3793669^2 + 2963310^2 .

It is a cyclic number.

It is not a de Polignac number, because 23173130637661 - 2³⁹ = 22623374823773 is a prime.

It is a super-3 number, since 3×23173130637661³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23173130635661) 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, 328038000 + ... + 328108633.

It is an arithmetic number, because the mean of its divisors is an integer number (5793446704903).

Almost surely, 2^{23173130637661} is an apocalyptic number.

It is an amenable number.

23173130637661 is a deficient number, since it is larger than the sum of its proper divisors (656181951).

23173130637661 is an equidigital number, since it uses as much as digits as its factorization.

23173130637661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656181950.

The product of its (nonzero) digits is 1714608, while the sum is 49.

The spelling of 23173130637661 in words is "twenty-three trillion, one hundred seventy-three billion, one hundred thirty million, six hundred thirty-seven thousand, six hundred sixty-one".