2153630006666 has 4 divisors (see below), whose sum is σ = 3230445010002. Its totient is φ = 1076815003332.

The previous prime is 2153630006659. The next prime is 2153630006683. The reversal of 2153630006666 is 6666000363512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2000145490225 + 153484516441 = 1414265^2 + 391771^2 .

It is a super-2 number, since 2×2153630006666² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538407501665 + ... + 538407501668.

Almost surely, 2^{2153630006666} is an apocalyptic number.

2153630006666 is a deficient number, since it is larger than the sum of its proper divisors (1076815003336).

2153630006666 is a wasteful number, since it uses less digits than its factorization.

2153630006666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076815003335.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 2153630006666 in words is "two trillion, one hundred fifty-three billion, six hundred thirty million, six thousand, six hundred sixty-six".