215351295977 has 2 divisors, whose sum is σ = 215351295978. Its totient is φ = 215351295976.

The previous prime is 215351295959. The next prime is 215351295979. The reversal of 215351295977 is 779592153512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179118554176 + 36232741801 = 423224^2 + 190349^2 .

It is a cyclic number.

It is not a de Polignac number, because 215351295977 - 2¹⁶ = 215351230441 is a prime.

Together with 215351295979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215351295979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107675647988 + 107675647989.

It is an arithmetic number, because the mean of its divisors is an integer number (107675647989).

Almost surely, 2^215351295977 is an apocalyptic number.

It is an amenable number.

215351295977 is a deficient number, since it is larger than the sum of its proper divisors (1).

215351295977 is an equidigital number, since it uses as much as digits as its factorization.

215351295977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5953500, while the sum is 56.

The spelling of 215351295977 in words is "two hundred fifteen billion, three hundred fifty-one million, two hundred ninety-five thousand, nine hundred seventy-seven".