20215551504157 has 2 divisors, whose sum is σ = 20215551504158. Its totient is φ = 20215551504156.

The previous prime is 20215551504097. The next prime is 20215551504167. The reversal of 20215551504157 is 75140515551202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19503272895001 + 712278609156 = 4416251^2 + 843966^2 .

It is a cyclic number.

It is not a de Polignac number, because 20215551504157 - 2²³ = 20215543115549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20215551504167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10107775752078 + 10107775752079.

It is an arithmetic number, because the mean of its divisors is an integer number (10107775752079).

Almost surely, 2^{20215551504157} is an apocalyptic number.

It is an amenable number.

20215551504157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20215551504157 is an equidigital number, since it uses as much as digits as its factorization.

20215551504157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350000, while the sum is 43.

The spelling of 20215551504157 in words is "twenty trillion, two hundred fifteen billion, five hundred fifty-one million, five hundred four thousand, one hundred fifty-seven".