18435731642 has 8 divisors (see below), whose sum is σ = 27727736916. Its totient is φ = 9193152672.

The previous prime is 18435731641. The next prime is 18435731653. The reversal of 18435731642 is 24613753481.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15564808081 + 2870923561 = 124759^2 + 53581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18435731642³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18435731593 and 18435731602.

It is not an unprimeable number, because it can be changed into a prime (18435731641) 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, 12355643 + ... + 12357134.

Almost surely, 2^18435731642 is an apocalyptic number.

18435731642 is a deficient number, since it is larger than the sum of its proper divisors (9292005274).

18435731642 is a wasteful number, since it uses less digits than its factorization.

18435731642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24713152.

The product of its digits is 483840, while the sum is 44.

The spelling of 18435731642 in words is "eighteen billion, four hundred thirty-five million, seven hundred thirty-one thousand, six hundred forty-two".