101861020055 has 4 divisors (see below), whose sum is σ = 122233224072. Its totient is φ = 81488816040.

The previous prime is 101861020031. The next prime is 101861020081. The reversal of 101861020055 is 550020168101.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 101861020055 - 2²⁴ = 101844242839 is a prime.

It is a super-2 number, since 2×101861020055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10186102001 + ... + 10186102010.

It is an arithmetic number, because the mean of its divisors is an integer number (30558306018).

Almost surely, 2^101861020055 is an apocalyptic number.

101861020055 is a deficient number, since it is larger than the sum of its proper divisors (20372204017).

101861020055 is an equidigital number, since it uses as much as digits as its factorization.

101861020055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20372204016.

The product of its (nonzero) digits is 2400, while the sum is 29.

Adding to 101861020055 its reverse (550020168101), we get a palindrome (651881188156).

The spelling of 101861020055 in words is "one hundred one billion, eight hundred sixty-one million, twenty thousand, fifty-five".