20345534661664 has 12 divisors (see below), whose sum is σ = 40055271365214. Its totient is φ = 10172767330816.

The previous prime is 20345534661631. The next prime is 20345534661667. The reversal of 20345534661664 is 46616643554302.

It can be written as a sum of positive squares in only one way, i.e., 14535217250064 + 5810317411600 = 3812508^2 + 2410460^2 .

It is not an unprimeable number, because it can be changed into a prime (20345534661667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317898979057 + ... + 317898979120.

Almost surely, 2^{20345534661664} is an apocalyptic number.

It is an amenable number.

20345534661664 is a deficient number, since it is larger than the sum of its proper divisors (19709736703550).

20345534661664 is an equidigital number, since it uses as much as digits as its factorization.

20345534661664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635797958187 (or 635797958179 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 55.

The spelling of 20345534661664 in words is "twenty trillion, three hundred forty-five billion, five hundred thirty-four million, six hundred sixty-one thousand, six hundred sixty-four".