40243551653 has 2 divisors, whose sum is σ = 40243551654. Its totient is φ = 40243551652.

The previous prime is 40243551643. The next prime is 40243551661. The reversal of 40243551653 is 35615534204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37381515649 + 2862036004 = 193343^2 + 53498^2 .

It is a cyclic number.

It is not a de Polignac number, because 40243551653 - 2¹⁰ = 40243550629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40243551643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20121775826 + 20121775827.

It is an arithmetic number, because the mean of its divisors is an integer number (20121775827).

Almost surely, 2^40243551653 is an apocalyptic number.

It is an amenable number.

40243551653 is a deficient number, since it is larger than the sum of its proper divisors (1).

40243551653 is an equidigital number, since it uses as much as digits as its factorization.

40243551653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 38.

It can be divided in two parts, 40243551 and 653, that added together give a palindrome (40244204).

The spelling of 40243551653 in words is "forty billion, two hundred forty-three million, five hundred fifty-one thousand, six hundred fifty-three".