20153105123 has 2 divisors, whose sum is σ = 20153105124. Its totient is φ = 20153105122.

The previous prime is 20153105081. The next prime is 20153105143. The reversal of 20153105123 is 32150135102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20153105123 - 2²² = 20148910819 is a prime.

It is a super-2 number, since 2×20153105123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20153105143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10076552561 + 10076552562.

It is an arithmetic number, because the mean of its divisors is an integer number (10076552562).

Almost surely, 2^20153105123 is an apocalyptic number.

20153105123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20153105123 is an equidigital number, since it uses as much as digits as its factorization.

20153105123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

The spelling of 20153105123 in words is "twenty billion, one hundred fifty-three million, one hundred five thousand, one hundred twenty-three".