78629577841 has 2 divisors, whose sum is σ = 78629577842. Its totient is φ = 78629577840.

The previous prime is 78629577809. The next prime is 78629577847. The reversal of 78629577841 is 14877592687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70479099441 + 8150478400 = 265479^2 + 90280^2 .

It is a cyclic number.

It is not a de Polignac number, because 78629577841 - 2⁵ = 78629577809 is a prime.

It is a super-2 number, since 2×78629577841² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78629577847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39314788920 + 39314788921.

It is an arithmetic number, because the mean of its divisors is an integer number (39314788921).

Almost surely, 2^78629577841 is an apocalyptic number.

It is an amenable number.

78629577841 is a deficient number, since it is larger than the sum of its proper divisors (1).

78629577841 is an equidigital number, since it uses as much as digits as its factorization.

78629577841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47416320, while the sum is 64.

The spelling of 78629577841 in words is "seventy-eight billion, six hundred twenty-nine million, five hundred seventy-seven thousand, eight hundred forty-one".