20155653673 has 2 divisors, whose sum is σ = 20155653674. Its totient is φ = 20155653672.

The previous prime is 20155653647. The next prime is 20155653677. The reversal of 20155653673 is 37635655102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20099583529 + 56070144 = 141773^2 + 7488^2 .

It is a cyclic number.

It is not a de Polignac number, because 20155653673 - 2¹³ = 20155645481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20155653677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077826836 + 10077826837.

It is an arithmetic number, because the mean of its divisors is an integer number (10077826837).

Almost surely, 2^20155653673 is an apocalyptic number.

It is an amenable number.

20155653673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155653673 is an equidigital number, since it uses as much as digits as its factorization.

20155653673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567000, while the sum is 43.

The spelling of 20155653673 in words is "twenty billion, one hundred fifty-five million, six hundred fifty-three thousand, six hundred seventy-three".