215220701660001 has 4 divisors (see below), whose sum is σ = 286960935546672. Its totient is φ = 143480467773332.

The previous prime is 215220701659991. The next prime is 215220701660011. The reversal of 215220701660001 is 100066107022512.

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 an interprime number because it is at equal distance from previous prime (215220701659991) and next prime (215220701660011).

It is a cyclic number.

It is not a de Polignac number, because 215220701660001 - 2²¹ = 215220699562849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215220701660011) 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, 35870116943331 + ... + 35870116943336.

It is an arithmetic number, because the mean of its divisors is an integer number (71740233886668).

Almost surely, 2^{215220701660001} is an apocalyptic number.

It is an amenable number.

215220701660001 is a deficient number, since it is larger than the sum of its proper divisors (71740233886671).

215220701660001 is an equidigital number, since it uses as much as digits as its factorization.

215220701660001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71740233886670.

The product of its (nonzero) digits is 10080, while the sum is 33.

Adding to 215220701660001 its reverse (100066107022512), we get a palindrome (315286808682513).

The spelling of 215220701660001 in words is "two hundred fifteen trillion, two hundred twenty billion, seven hundred one million, six hundred sixty thousand, one".