20133131377 has 2 divisors, whose sum is σ = 20133131378. Its totient is φ = 20133131376.

The previous prime is 20133131353. The next prime is 20133131383. The reversal of 20133131377 is 77313133102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18300948961 + 1832182416 = 135281^2 + 42804^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133131377 - 2²³ = 20124742769 is a prime.

It is a super-2 number, since 2×20133131377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20133132377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066565688 + 10066565689.

It is an arithmetic number, because the mean of its divisors is an integer number (10066565689).

Almost surely, 2^20133131377 is an apocalyptic number.

It is an amenable number.

20133131377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20133131377 is an equidigital number, since it uses as much as digits as its factorization.

20133131377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 31.

Adding to 20133131377 its reverse (77313133102), we get a palindrome (97446264479).

The spelling of 20133131377 in words is "twenty billion, one hundred thirty-three million, one hundred thirty-one thousand, three hundred seventy-seven".