40191499906 has 4 divisors (see below), whose sum is σ = 60287249862. Its totient is φ = 20095749952.

The previous prime is 40191499903. The next prime is 40191499927. The reversal of 40191499906 is 60999419104.

40191499906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 33100344225 + 7091155681 = 181935^2 + 84209^2 .

It is not an unprimeable number, because it can be changed into a prime (40191499903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10047874975 + ... + 10047874978.

Almost surely, 2^40191499906 is an apocalyptic number.

40191499906 is a deficient number, since it is larger than the sum of its proper divisors (20095749956).

40191499906 is a wasteful number, since it uses less digits than its factorization.

40191499906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095749955.

The product of its (nonzero) digits is 629856, while the sum is 52.

The spelling of 40191499906 in words is "forty billion, one hundred ninety-one million, four hundred ninety-nine thousand, nine hundred six".