40178902949 has 2 divisors, whose sum is σ = 40178902950. Its totient is φ = 40178902948.

The previous prime is 40178902927. The next prime is 40178902961. The reversal of 40178902949 is 94920987104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37846978849 + 2331924100 = 194543^2 + 48290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40178902949 is a prime.

It is a super-2 number, since 2×40178902949² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40178902949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40178902979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20089451474 + 20089451475.

It is an arithmetic number, because the mean of its divisors is an integer number (20089451475).

Almost surely, 2^40178902949 is an apocalyptic number.

It is an amenable number.

40178902949 is a deficient number, since it is larger than the sum of its proper divisors (1).

40178902949 is an equidigital number, since it uses as much as digits as its factorization.

40178902949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 40178902949 in words is "forty billion, one hundred seventy-eight million, nine hundred two thousand, nine hundred forty-nine".