215112051551 has 2 divisors, whose sum is σ = 215112051552. Its totient is φ = 215112051550.

The previous prime is 215112051443. The next prime is 215112051563. The reversal of 215112051551 is 155150211512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215112051551 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215112051571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107556025775 + 107556025776.

It is an arithmetic number, because the mean of its divisors is an integer number (107556025776).

Almost surely, 2^215112051551 is an apocalyptic number.

215112051551 is a deficient number, since it is larger than the sum of its proper divisors (1).

215112051551 is an equidigital number, since it uses as much as digits as its factorization.

215112051551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 29.

The spelling of 215112051551 in words is "two hundred fifteen billion, one hundred twelve million, fifty-one thousand, five hundred fifty-one".