40020179779 has 4 divisors (see below), whose sum is σ = 40374340776. Its totient is φ = 39666018784.

The previous prime is 40020179741. The next prime is 40020179821. The reversal of 40020179779 is 97797102004.

40020179779 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 is a cyclic number.

It is not a de Polignac number, because 40020179779 - 2²¹ = 40018082627 is a prime.

It is a super-2 number, since 2×40020179779² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40020179879) 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, 177080329 + ... + 177080554.

It is an arithmetic number, because the mean of its divisors is an integer number (10093585194).

Almost surely, 2^40020179779 is an apocalyptic number.

40020179779 is a deficient number, since it is larger than the sum of its proper divisors (354160997).

40020179779 is a wasteful number, since it uses less digits than its factorization.

40020179779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354160996.

The product of its (nonzero) digits is 222264, while the sum is 46.

The spelling of 40020179779 in words is "forty billion, twenty million, one hundred seventy-nine thousand, seven hundred seventy-nine".