215544002551 has 2 divisors, whose sum is σ = 215544002552. Its totient is φ = 215544002550.

The previous prime is 215544002413. The next prime is 215544002563. The reversal of 215544002551 is 155200445512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215544002551 - 2¹³ = 215543994359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215544002951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107772001275 + 107772001276.

It is an arithmetic number, because the mean of its divisors is an integer number (107772001276).

Almost surely, 2^215544002551 is an apocalyptic number.

215544002551 is a deficient number, since it is larger than the sum of its proper divisors (1).

215544002551 is an equidigital number, since it uses as much as digits as its factorization.

215544002551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 215544002551 in words is "two hundred fifteen billion, five hundred forty-four million, two thousand, five hundred fifty-one".