20153133661 has 8 divisors (see below), whose sum is σ = 20639473184. Its totient is φ = 19667597040.

The previous prime is 20153133629. The next prime is 20153133673. The reversal of 20153133661 is 16633135102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20153133661 - 2⁵ = 20153133629 is a prime.

It is a super-2 number, since 2×20153133661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20153133461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149766 + ... + 250471.

It is an arithmetic number, because the mean of its divisors is an integer number (2579934148).

Almost surely, 2^20153133661 is an apocalyptic number.

It is an amenable number.

20153133661 is a deficient number, since it is larger than the sum of its proper divisors (486339523).

20153133661 is a wasteful number, since it uses less digits than its factorization.

20153133661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401451.

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 20153133661 its reverse (16633135102), we get a palindrome (36786268763).

The spelling of 20153133661 in words is "twenty billion, one hundred fifty-three million, one hundred thirty-three thousand, six hundred sixty-one".