20156233265149 has 2 divisors, whose sum is σ = 20156233265150. Its totient is φ = 20156233265148.

The previous prime is 20156233265101. The next prime is 20156233265167. The reversal of 20156233265149 is 94156233265102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12645975229924 + 7510258035225 = 3556118^2 + 2740485^2 .

It is a cyclic number.

It is not a de Polignac number, because 20156233265149 - 2¹⁷ = 20156233134077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20156233245149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078116632574 + 10078116632575.

It is an arithmetic number, because the mean of its divisors is an integer number (10078116632575).

Almost surely, 2^{20156233265149} is an apocalyptic number.

It is an amenable number.

20156233265149 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156233265149 is an equidigital number, since it uses as much as digits as its factorization.

20156233265149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 20156233265149 in words is "twenty trillion, one hundred fifty-six billion, two hundred thirty-three million, two hundred sixty-five thousand, one hundred forty-nine".