20525315502551 has 2 divisors, whose sum is σ = 20525315502552. Its totient is φ = 20525315502550.

The previous prime is 20525315502541. The next prime is 20525315502557. The reversal of 20525315502551 is 15520551352502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20525315502551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20525315502499 and 20525315502508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20525315502557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10262657751275 + 10262657751276.

It is an arithmetic number, because the mean of its divisors is an integer number (10262657751276).

Almost surely, 2^{20525315502551} is an apocalyptic number.

20525315502551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20525315502551 is an equidigital number, since it uses as much as digits as its factorization.

20525315502551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 375000, while the sum is 41.

The spelling of 20525315502551 in words is "twenty trillion, five hundred twenty-five billion, three hundred fifteen million, five hundred two thousand, five hundred fifty-one".