215677155493 has 2 divisors, whose sum is σ = 215677155494. Its totient is φ = 215677155492.

The previous prime is 215677155461. The next prime is 215677155509. The reversal of 215677155493 is 394551776512.

215677155493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213252774849 + 2424380644 = 461793^2 + 49238^2 .

It is a cyclic number.

It is not a de Polignac number, because 215677155493 - 2⁵ = 215677155461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215677155403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107838577746 + 107838577747.

It is an arithmetic number, because the mean of its divisors is an integer number (107838577747).

Almost surely, 2^215677155493 is an apocalyptic number.

It is an amenable number.

215677155493 is a deficient number, since it is larger than the sum of its proper divisors (1).

215677155493 is an equidigital number, since it uses as much as digits as its factorization.

215677155493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938000, while the sum is 55.

The spelling of 215677155493 in words is "two hundred fifteen billion, six hundred seventy-seven million, one hundred fifty-five thousand, four hundred ninety-three".