20153033261 has 2 divisors, whose sum is σ = 20153033262. Its totient is φ = 20153033260.

The previous prime is 20153033239. The next prime is 20153033287. The reversal of 20153033261 is 16233035102.

It is an a-pointer prime, because the next prime (20153033287) can be obtained adding 20153033261 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18226350025 + 1926683236 = 135005^2 + 43894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20153033261 is a prime.

It is a super-2 number, since 2×20153033261² (a number of 21 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 20153033261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20153033291) 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 as a sum of consecutive naturals, namely, 10076516630 + 10076516631.

It is an arithmetic number, because the mean of its divisors is an integer number (10076516631).

Almost surely, 2^20153033261 is an apocalyptic number.

It is an amenable number.

20153033261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20153033261 is an equidigital number, since it uses as much as digits as its factorization.

20153033261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 20153033261 its reverse (16233035102), we get a palindrome (36386068363).

The spelling of 20153033261 in words is "twenty billion, one hundred fifty-three million, thirty-three thousand, two hundred sixty-one".