40986535521961 has 4 divisors (see below), whose sum is σ = 40987312290900. Its totient is φ = 40985758753024.

The previous prime is 40986535521959. The next prime is 40986535522021. The reversal of 40986535521961 is 16912553568904.

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 2 ways, for example, as 9832489062400 + 31154046459561 = 3135680^2 + 5581581^2 .

It is a cyclic number.

It is not a de Polignac number, because 40986535521961 - 2¹ = 40986535521959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40986535521893 and 40986535521902.

It is not an unprimeable number, because it can be changed into a prime (40986535521901) 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, 388305316 + ... + 388410853.

It is an arithmetic number, because the mean of its divisors is an integer number (10246828072725).

Almost surely, 2^{40986535521961} is an apocalyptic number.

It is an amenable number.

40986535521961 is a deficient number, since it is larger than the sum of its proper divisors (776768939).

40986535521961 is an equidigital number, since it uses as much as digits as its factorization.

40986535521961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776768938.

The product of its (nonzero) digits is 69984000, while the sum is 64.

The spelling of 40986535521961 in words is "forty trillion, nine hundred eighty-six billion, five hundred thirty-five million, five hundred twenty-one thousand, nine hundred sixty-one".