2153135216666 has 24 divisors (see below), whose sum is σ = 3886553017620. Its totient is φ = 890952502272.

The previous prime is 2153135216611. The next prime is 2153135216669. The reversal of 2153135216666 is 6666125313512.

It can be written as a sum of positive squares in 2 ways, for example, as 2137604823025 + 15530393641 = 1462055^2 + 124621^2 .

It is a super-2 number, since 2×2153135216666² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2153135216666.

It is not an unprimeable number, because it can be changed into a prime (2153135216669) 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 11 ways as a sum of consecutive naturals, for example, 378803495 + ... + 378809178.

Almost surely, 2^{2153135216666} is an apocalyptic number.

2153135216666 is a deficient number, since it is larger than the sum of its proper divisors (1733417800954).

2153135216666 is a wasteful number, since it uses less digits than its factorization.

2153135216666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757612718 (or 757612711 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 47.

The spelling of 2153135216666 in words is "two trillion, one hundred fifty-three billion, one hundred thirty-five million, two hundred sixteen thousand, six hundred sixty-six".