101401645638 has 16 divisors (see below), whose sum is σ = 204262309440. Its totient is φ = 33557378856.

The previous prime is 101401645633. The next prime is 101401645649. The reversal of 101401645638 is 836546104101.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101401645596 and 101401645605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101401645633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60791520 + ... + 60793187.

It is an arithmetic number, because the mean of its divisors is an integer number (12766394340).

Almost surely, 2^101401645638 is an apocalyptic number.

101401645638 is an abundant number, since it is smaller than the sum of its proper divisors (102860663802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101401645638 is a wasteful number, since it uses less digits than its factorization.

101401645638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121584851.

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 101401645638 its reverse (836546104101), we get a palindrome (937947749739).

The spelling of 101401645638 in words is "one hundred one billion, four hundred one million, six hundred forty-five thousand, six hundred thirty-eight".