88661262720021 has 4 divisors (see below), whose sum is σ = 118215016960032. Its totient is φ = 59107508480012.

The previous prime is 88661262720013. The next prime is 88661262720047. The reversal of 88661262720021 is 12002726216688.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 88661262720021 - 2³ = 88661262720013 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 (88661262720221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14776877120001 + ... + 14776877120006.

It is an arithmetic number, because the mean of its divisors is an integer number (29553754240008).

Almost surely, 2^{88661262720021} is an apocalyptic number.

It is an amenable number.

88661262720021 is a deficient number, since it is larger than the sum of its proper divisors (29553754240011).

88661262720021 is a wasteful number, since it uses less digits than its factorization.

88661262720021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29553754240010.

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 88661262720021 in words is "eighty-eight trillion, six hundred sixty-one billion, two hundred sixty-two million, seven hundred twenty thousand, twenty-one".