40640935493 has 4 divisors (see below), whose sum is σ = 40649704620. Its totient is φ = 40632166368.

The previous prime is 40640935487. The next prime is 40640935507. The reversal of 40640935493 is 39453904604.

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 23317900804 + 17323034689 = 152702^2 + 131617^2 .

It is a cyclic number.

It is not a de Polignac number, because 40640935493 - 2⁴ = 40640935477 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 (40640935483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4377608 + ... + 4386881.

It is an arithmetic number, because the mean of its divisors is an integer number (10162426155).

Almost surely, 2^40640935493 is an apocalyptic number.

It is an amenable number.

40640935493 is a deficient number, since it is larger than the sum of its proper divisors (8769127).

40640935493 is an equidigital number, since it uses as much as digits as its factorization.

40640935493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8769126.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 40640935493 in words is "forty billion, six hundred forty million, nine hundred thirty-five thousand, four hundred ninety-three".