40821777929 has 2 divisors, whose sum is σ = 40821777930. Its totient is φ = 40821777928.

The previous prime is 40821777883. The next prime is 40821777937. The reversal of 40821777929 is 92977712804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37510005625 + 3311772304 = 193675^2 + 57548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40821777929 is a prime.

It is not a weakly prime, because it can be changed into another prime (40821747929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410888964 + 20410888965.

It is an arithmetic number, because the mean of its divisors is an integer number (20410888965).

Almost surely, 2^40821777929 is an apocalyptic number.

It is an amenable number.

40821777929 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821777929 is an equidigital number, since it uses as much as digits as its factorization.

40821777929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 40821777929 in words is "forty billion, eight hundred twenty-one million, seven hundred seventy-seven thousand, nine hundred twenty-nine".