40105506181738 has 4 divisors (see below), whose sum is σ = 60158259272610. Its totient is φ = 20052753090868.

The previous prime is 40105506181733. The next prime is 40105506181799. The reversal of 40105506181738 is 83718160550104.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 37217161744569 + 2888344437169 = 6100587^2 + 1699513^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40105506181691 and 40105506181700.

It is not an unprimeable number, because it can be changed into a prime (40105506181733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10026376545433 + ... + 10026376545436.

Almost surely, 2^{40105506181738} is an apocalyptic number.

40105506181738 is a deficient number, since it is larger than the sum of its proper divisors (20052753090872).

40105506181738 is a wasteful number, since it uses less digits than its factorization.

40105506181738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20052753090871.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 40105506181738 in words is "forty trillion, one hundred five billion, five hundred six million, one hundred eighty-one thousand, seven hundred thirty-eight".