97217921755 has 16 divisors (see below), whose sum is σ = 117043827264. Its totient is φ = 77519756160.

The previous prime is 97217921753. The next prime is 97217921761. The reversal of 97217921755 is 55712971279.

It is not a de Polignac number, because 97217921755 - 2¹ = 97217921753 is a prime.

It is a super-2 number, since 2×97217921755² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97217921696 and 97217921705.

It is not an unprimeable number, because it can be changed into a prime (97217921753) 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 in 15 ways as a sum of consecutive naturals, for example, 2707570 + ... + 2743240.

It is an arithmetic number, because the mean of its divisors is an integer number (7315239204).

Almost surely, 2^97217921755 is an apocalyptic number.

97217921755 is a deficient number, since it is larger than the sum of its proper divisors (19825905509).

97217921755 is a wasteful number, since it uses less digits than its factorization.

97217921755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37446.

The product of its digits is 2778300, while the sum is 55.

The spelling of 97217921755 in words is "ninety-seven billion, two hundred seventeen million, nine hundred twenty-one thousand, seven hundred fifty-five".