217772065107 has 8 divisors (see below), whose sum is σ = 322625281680. Its totient is φ = 145181376720.

The previous prime is 217772065087. The next prime is 217772065139. The reversal of 217772065107 is 701560277712.

It is not a de Polignac number, because 217772065107 - 2¹¹ = 217772063059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217772015107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4032815994 + ... + 4032816047.

It is an arithmetic number, because the mean of its divisors is an integer number (40328160210).

Almost surely, 2^217772065107 is an apocalyptic number.

217772065107 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

217772065107 is a deficient number, since it is larger than the sum of its proper divisors (104853216573).

217772065107 is an equidigital number, since it uses as much as digits as its factorization.

217772065107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8065632050 (or 8065632044 counting only the distinct ones).

The product of its (nonzero) digits is 288120, while the sum is 45.

The spelling of 217772065107 in words is "two hundred seventeen billion, seven hundred seventy-two million, sixty-five thousand, one hundred seven".