40978555361 has 2 divisors, whose sum is σ = 40978555362. Its totient is φ = 40978555360.

The previous prime is 40978555339. The next prime is 40978555421. The reversal of 40978555361 is 16355587904.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37029689761 + 3948865600 = 192431^2 + 62840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40978555361 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40978555561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20489277680 + 20489277681.

It is an arithmetic number, because the mean of its divisors is an integer number (20489277681).

Almost surely, 2^40978555361 is an apocalyptic number.

It is an amenable number.

40978555361 is a deficient number, since it is larger than the sum of its proper divisors (1).

40978555361 is an equidigital number, since it uses as much as digits as its factorization.

40978555361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536000, while the sum is 53.

The spelling of 40978555361 in words is "forty billion, nine hundred seventy-eight million, five hundred fifty-five thousand, three hundred sixty-one".