217376320749 has 64 divisors (see below), whose sum is σ = 362445373440. Its totient is φ = 113009909760.

The previous prime is 217376320727. The next prime is 217376320757. The reversal of 217376320749 is 947023673712.

It is not a de Polignac number, because 217376320749 - 2⁷ = 217376320621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217376320769) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10270672 + ... + 10291814.

It is an arithmetic number, because the mean of its divisors is an integer number (5663208960).

Almost surely, 2^217376320749 is an apocalyptic number.

It is an amenable number.

217376320749 is a deficient number, since it is larger than the sum of its proper divisors (145069052691).

217376320749 is a wasteful number, since it uses less digits than its factorization.

217376320749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

The product of its (nonzero) digits is 2667168, while the sum is 51.

The spelling of 217376320749 in words is "two hundred seventeen billion, three hundred seventy-six million, three hundred twenty thousand, seven hundred forty-nine".