100649888081 has 2 divisors, whose sum is σ = 100649888082. Its totient is φ = 100649888080.

The previous prime is 100649888077. The next prime is 100649888083. The reversal of 100649888081 is 180888946001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65290470400 + 35359417681 = 255520^2 + 188041^2 .

It is a cyclic number.

It is not a de Polignac number, because 100649888081 - 2² = 100649888077 is a prime.

It is a super-2 number, since 2×100649888081² (a number of 23 digits) contains 22 as substring.

Together with 100649888083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (100649888083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50324944040 + 50324944041.

It is an arithmetic number, because the mean of its divisors is an integer number (50324944041).

Almost surely, 2^100649888081 is an apocalyptic number.

It is an amenable number.

100649888081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100649888081 is an equidigital number, since it uses as much as digits as its factorization.

100649888081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 884736, while the sum is 53.

The spelling of 100649888081 in words is "one hundred billion, six hundred forty-nine million, eight hundred eighty-eight thousand, eighty-one".