72423432101 has 4 divisors (see below), whose sum is σ = 72511646604. Its totient is φ = 72335217600.

The previous prime is 72423432091. The next prime is 72423432197. The reversal of 72423432101 is 10123432427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39942021025 + 32481411076 = 199855^2 + 180226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72423432101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72423437101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44106020 + ... + 44107661.

It is an arithmetic number, because the mean of its divisors is an integer number (18127911651).

Almost surely, 2^72423432101 is an apocalyptic number.

It is an amenable number.

72423432101 is a deficient number, since it is larger than the sum of its proper divisors (88214503).

72423432101 is an equidigital number, since it uses as much as digits as its factorization.

72423432101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88214502.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 72423432101 its reverse (10123432427), we get a palindrome (82546864528).

It can be divided in two parts, 7242 and 3432101, that added together give a palindrome (3439343).

The spelling of 72423432101 in words is "seventy-two billion, four hundred twenty-three million, four hundred thirty-two thousand, one hundred one".