40891073689 has 4 divisors (see below), whose sum is σ = 40891705956. Its totient is φ = 40890441424.

The previous prime is 40891073659. The next prime is 40891073759. The reversal of 40891073689 is 98637019804.

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 23136843664 + 17754230025 = 152108^2 + 133245^2 .

It is a cyclic number.

It is not a de Polignac number, because 40891073689 - 2¹⁵ = 40891040921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40891073659) 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, 206434 + ... + 352699.

It is an arithmetic number, because the mean of its divisors is an integer number (10222926489).

Almost surely, 2^40891073689 is an apocalyptic number.

It is an amenable number.

40891073689 is a deficient number, since it is larger than the sum of its proper divisors (632267).

40891073689 is an equidigital number, since it uses as much as digits as its factorization.

40891073689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632266.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 40891073689 in words is "forty billion, eight hundred ninety-one million, seventy-three thousand, six hundred eighty-nine".