88821720170829 has 12 divisors (see below), whose sum is σ = 129159100921500. Its totient is φ = 58817067494784.

The previous prime is 88821720170819. The next prime is 88821720170831. The reversal of 88821720170829 is 92807102712888.

It can be written as a sum of positive squares in 2 ways, for example, as 8287662168900 + 80534058001929 = 2878830^2 + 8974077^2 .

It is not a de Polignac number, because 88821720170829 - 2¹² = 88821720166733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88821720170819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33117716844 + ... + 33117719525.

It is an arithmetic number, because the mean of its divisors is an integer number (10763258410125).

Almost surely, 2^{88821720170829} is an apocalyptic number.

It is an amenable number.

88821720170829 is a deficient number, since it is larger than the sum of its proper divisors (40337380750671).

88821720170829 is a wasteful number, since it uses less digits than its factorization.

88821720170829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66235436524 (or 66235436521 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 63.

The spelling of 88821720170829 in words is "eighty-eight trillion, eight hundred twenty-one billion, seven hundred twenty million, one hundred seventy thousand, eight hundred twenty-nine".