20101523312551 has 2 divisors, whose sum is σ = 20101523312552. Its totient is φ = 20101523312550.

The previous prime is 20101523312539. The next prime is 20101523312573. The reversal of 20101523312551 is 15521332510102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20101523312551 - 2³⁹ = 19551767498663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101523312951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050761656275 + 10050761656276.

It is an arithmetic number, because the mean of its divisors is an integer number (10050761656276).

Almost surely, 2^{20101523312551} is an apocalyptic number.

20101523312551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101523312551 is an equidigital number, since it uses as much as digits as its factorization.

20101523312551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 20101523312551 its reverse (15521332510102), we get a palindrome (35622855822653).

The spelling of 20101523312551 in words is "twenty trillion, one hundred one billion, five hundred twenty-three million, three hundred twelve thousand, five hundred fifty-one".