40420668209 has 8 divisors (see below), whose sum is σ = 40538629320. Its totient is φ = 40302821376.

The previous prime is 40420668203. The next prime is 40420668221. The reversal of 40420668209 is 90286602404.

It can be written as a sum of positive squares in 4 ways, for example, as 13729277584 + 26691390625 = 117172^2 + 163375^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 40420668209 - 2⁴ = 40420668193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40420668203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707297 + ... + 762305.

It is an arithmetic number, because the mean of its divisors is an integer number (5067328665).

Almost surely, 2^40420668209 is an apocalyptic number.

It is an amenable number.

40420668209 is a deficient number, since it is larger than the sum of its proper divisors (117961111).

40420668209 is a wasteful number, since it uses less digits than its factorization.

40420668209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57139.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 40420668209 in words is "forty billion, four hundred twenty million, six hundred sixty-eight thousand, two hundred nine".