20315255567 has 2 divisors, whose sum is σ = 20315255568. Its totient is φ = 20315255566.

The previous prime is 20315255549. The next prime is 20315255591. The reversal of 20315255567 is 76555251302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20315255567 - 2⁶ = 20315255503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20315255167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157627783 + 10157627784.

It is an arithmetic number, because the mean of its divisors is an integer number (10157627784).

Almost surely, 2^20315255567 is an apocalyptic number.

20315255567 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315255567 is an equidigital number, since it uses as much as digits as its factorization.

20315255567 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 315000, while the sum is 41.

The spelling of 20315255567 in words is "twenty billion, three hundred fifteen million, two hundred fifty-five thousand, five hundred sixty-seven".