40388993461 has 2 divisors, whose sum is σ = 40388993462. Its totient is φ = 40388993460.

The previous prime is 40388993423. The next prime is 40388993471. The reversal of 40388993461 is 16439988304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20590815025 + 19798178436 = 143495^2 + 140706^2 .

It is a cyclic number.

It is not a de Polignac number, because 40388993461 - 2¹¹ = 40388991413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40388993471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20194496730 + 20194496731.

It is an arithmetic number, because the mean of its divisors is an integer number (20194496731).

Almost surely, 2^40388993461 is an apocalyptic number.

It is an amenable number.

40388993461 is a deficient number, since it is larger than the sum of its proper divisors (1).

40388993461 is an equidigital number, since it uses as much as digits as its factorization.

40388993461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 55.

The spelling of 40388993461 in words is "forty billion, three hundred eighty-eight million, nine hundred ninety-three thousand, four hundred sixty-one".