40447769977 has 2 divisors, whose sum is σ = 40447769978. Its totient is φ = 40447769976.

The previous prime is 40447769969. The next prime is 40447770023. The reversal of 40447769977 is 77996774404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26941611321 + 13506158656 = 164139^2 + 116216^2 .

It is a cyclic number.

It is not a de Polignac number, because 40447769977 - 2³ = 40447769969 is a prime.

It is a super-2 number, since 2×40447769977² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40447764977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20223884988 + 20223884989.

It is an arithmetic number, because the mean of its divisors is an integer number (20223884989).

Almost surely, 2^40447769977 is an apocalyptic number.

It is an amenable number.

40447769977 is a deficient number, since it is larger than the sum of its proper divisors (1).

40447769977 is an equidigital number, since it uses as much as digits as its factorization.

40447769977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74680704, while the sum is 64.

The spelling of 40447769977 in words is "forty billion, four hundred forty-seven million, seven hundred sixty-nine thousand, nine hundred seventy-seven".