215303501551 has 2 divisors, whose sum is σ = 215303501552. Its totient is φ = 215303501550.

The previous prime is 215303501513. The next prime is 215303501573. The reversal of 215303501551 is 155105303512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215303501551 - 2¹¹ = 215303499503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215301501551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107651750775 + 107651750776.

It is an arithmetic number, because the mean of its divisors is an integer number (107651750776).

Almost surely, 2^215303501551 is an apocalyptic number.

215303501551 is a deficient number, since it is larger than the sum of its proper divisors (1).

215303501551 is an equidigital number, since it uses as much as digits as its factorization.

215303501551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 215303501551 in words is "two hundred fifteen billion, three hundred three million, five hundred one thousand, five hundred fifty-one".