215666501996 has 24 divisors (see below), whose sum is σ = 411752569536. Its totient is φ = 98024130320.

The previous prime is 215666501989. The next prime is 215666502041. The reversal of 215666501996 is 699105666512.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605255 + ... + 893121.

It is an arithmetic number, because the mean of its divisors is an integer number (17156357064).

Almost surely, 2^215666501996 is an apocalyptic number.

It is an amenable number.

215666501996 is a deficient number, since it is larger than the sum of its proper divisors (196086067540).

215666501996 is a wasteful number, since it uses less digits than its factorization.

215666501996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304909 (or 304907 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 56.

The spelling of 215666501996 in words is "two hundred fifteen billion, six hundred sixty-six million, five hundred one thousand, nine hundred ninety-six".