40120328210661 has 12 divisors (see below), whose sum is σ = 58117635585100. Its totient is φ = 26670246831360.

The previous prime is 40120328210639. The next prime is 40120328210681. The reversal of 40120328210661 is 16601282302104.

It is a happy number.

40120328210661 is a `hidden beast` number, since 40 + 1 + 20 + 328 + 210 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34780388300100 + 5339939910561 = 5897490^2 + 2310831^2 .

It is not a de Polignac number, because 40120328210661 - 2²¹ = 40120326113509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120328210681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6386550220 + ... + 6386556501.

Almost surely, 2^{40120328210661} is an apocalyptic number.

It is an amenable number.

40120328210661 is a deficient number, since it is larger than the sum of its proper divisors (17997307374439).

40120328210661 is a wasteful number, since it uses less digits than its factorization.

40120328210661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12773107076 (or 12773107073 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 40120328210661 in words is "forty trillion, one hundred twenty billion, three hundred twenty-eight million, two hundred ten thousand, six hundred sixty-one".