20610436633661 has 12 divisors (see below), whose sum is σ = 23978773145340. Its totient is φ = 17663607400320.

The previous prime is 20610436633649. The next prime is 20610436633663. The reversal of 20610436633661 is 16633663401602.

It can be written as a sum of positive squares in 2 ways, for example, as 1863320551225 + 18747116082436 = 1365035^2 + 4329794^2 .

It is not a de Polignac number, because 20610436633661 - 2⁶ = 20610436633597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20610436633663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29184926 + ... + 29882783.

It is an arithmetic number, because the mean of its divisors is an integer number (1998231095445).

Almost surely, 2^{20610436633661} is an apocalyptic number.

It is an amenable number.

20610436633661 is a deficient number, since it is larger than the sum of its proper divisors (3368336511679).

20610436633661 is an equidigital number, since it uses as much as digits as its factorization.

20610436633661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59074844 (or 59074837 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 47.

The spelling of 20610436633661 in words is "twenty trillion, six hundred ten billion, four hundred thirty-six million, six hundred thirty-three thousand, six hundred sixty-one".