40845406493 has 2 divisors, whose sum is σ = 40845406494. Its totient is φ = 40845406492.

The previous prime is 40845406489. The next prime is 40845406513. The reversal of 40845406493 is 39460454804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39681436804 + 1163969689 = 199202^2 + 34117^2 .

It is a cyclic number.

It is not a de Polignac number, because 40845406493 - 2² = 40845406489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40845406993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20422703246 + 20422703247.

It is an arithmetic number, because the mean of its divisors is an integer number (20422703247).

Almost surely, 2^40845406493 is an apocalyptic number.

It is an amenable number.

40845406493 is a deficient number, since it is larger than the sum of its proper divisors (1).

40845406493 is an equidigital number, since it uses as much as digits as its factorization.

40845406493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 40845406493 in words is "forty billion, eight hundred forty-five million, four hundred six thousand, four hundred ninety-three".