215672263277561 has 2 divisors, whose sum is σ = 215672263277562. Its totient is φ = 215672263277560.

The previous prime is 215672263277543. The next prime is 215672263277623. The reversal of 215672263277561 is 165772362276512.

It is an a-pointer prime, because the next prime (215672263277623) can be obtained adding 215672263277561 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206506240605625 + 9166022671936 = 14370325^2 + 3027544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215672263277561 is a prime.

It is a super-2 number, since 2×215672263277561² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215672263277494 and 215672263277503.

It is not a weakly prime, because it can be changed into another prime (215672263277761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107836131638780 + 107836131638781.

It is an arithmetic number, because the mean of its divisors is an integer number (107836131638781).

Almost surely, 2^{215672263277561} is an apocalyptic number.

It is an amenable number.

215672263277561 is a deficient number, since it is larger than the sum of its proper divisors (1).

215672263277561 is an equidigital number, since it uses as much as digits as its factorization.

215672263277561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88905600, while the sum is 62.

The spelling of 215672263277561 in words is "two hundred fifteen trillion, six hundred seventy-two billion, two hundred sixty-three million, two hundred seventy-seven thousand, five hundred sixty-one".