20527557621664 has 12 divisors (see below), whose sum is σ = 40413629067714. Its totient is φ = 10263778810816.

The previous prime is 20527557621553. The next prime is 20527557621677. The reversal of 20527557621664 is 46612675572502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13767869618064 + 6759688003600 = 3710508^2 + 2599940^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20527557621599 and 20527557621608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320743087807 + ... + 320743087870.

Almost surely, 2^{20527557621664} is an apocalyptic number.

It is an amenable number.

20527557621664 is a deficient number, since it is larger than the sum of its proper divisors (19886071446050).

20527557621664 is an equidigital number, since it uses as much as digits as its factorization.

20527557621664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641486175687 (or 641486175679 counting only the distinct ones).

The product of its (nonzero) digits is 42336000, while the sum is 58.

The spelling of 20527557621664 in words is "twenty trillion, five hundred twenty-seven billion, five hundred fifty-seven million, six hundred twenty-one thousand, six hundred sixty-four".