20155423157 has 2 divisors, whose sum is σ = 20155423158. Its totient is φ = 20155423156.

The previous prime is 20155423111. The next prime is 20155423207. The reversal of 20155423157 is 75132455102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14134594321 + 6020828836 = 118889^2 + 77594^2 .

It is a cyclic number.

It is not a de Polignac number, because 20155423157 - 2¹² = 20155419061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20155423657) 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, 10077711578 + 10077711579.

It is an arithmetic number, because the mean of its divisors is an integer number (10077711579).

Almost surely, 2^20155423157 is an apocalyptic number.

It is an amenable number.

20155423157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155423157 is an equidigital number, since it uses as much as digits as its factorization.

20155423157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42000, while the sum is 35.

Adding to 20155423157 its reverse (75132455102), we get a palindrome (95287878259).

The spelling of 20155423157 in words is "twenty billion, one hundred fifty-five million, four hundred twenty-three thousand, one hundred fifty-seven".