215661007102000 has 80 divisors (see below), whose sum is σ = 532563385940352. Its totient is φ = 84428989977600.

The previous prime is 215661007101989. The next prime is 215661007102001. The reversal of 215661007102000 is 201700166512.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (215661007102001) 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, 1147039017 + ... + 1147227016.

Almost surely, 2^{215661007102000} is an apocalyptic number.

215661007102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215661007102000 is an abundant number, since it is smaller than the sum of its proper divisors (316902378838352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215661007102000 is a wasteful number, since it uses less digits than its factorization.

215661007102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294266103 (or 2294266087 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

Adding to 215661007102000 its reverse (201700166512), we get a palindrome (215862707268512).

The spelling of 215661007102000 in words is "two hundred fifteen trillion, six hundred sixty-one billion, seven million, one hundred two thousand".