20153623657 has 2 divisors, whose sum is σ = 20153623658. Its totient is φ = 20153623656.

The previous prime is 20153623643. The next prime is 20153623717. The reversal of 20153623657 is 75632635102.

20153623657 is nontrivially palindromic in base 2.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20114046976 + 39576681 = 141824^2 + 6291^2 .

It is a cyclic number.

It is not a de Polignac number, because 20153623657 - 2¹⁵ = 20153590889 is a prime.

It is not a weakly prime, because it can be changed into another prime (20153683657) 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, 10076811828 + 10076811829.

It is an arithmetic number, because the mean of its divisors is an integer number (10076811829).

Almost surely, 2^20153623657 is an apocalyptic number.

It is an amenable number.

20153623657 is a deficient number, since it is larger than the sum of its proper divisors (1).

20153623657 is an equidigital number, since it uses as much as digits as its factorization.

20153623657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 40.

The spelling of 20153623657 in words is "twenty billion, one hundred fifty-three million, six hundred twenty-three thousand, six hundred fifty-seven".