77081220001 has 4 divisors (see below), whose sum is σ = 77096662852. Its totient is φ = 77065777152.

The previous prime is 77081219983. The next prime is 77081220011. The reversal of 77081220001 is 10002218077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8541456400 + 68539763601 = 92420^2 + 261801^2 .

It is a cyclic number.

It is not a de Polignac number, because 77081220001 - 2²³ = 77072831393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77081220011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7713936 + ... + 7723921.

It is an arithmetic number, because the mean of its divisors is an integer number (19274165713).

Almost surely, 2^77081220001 is an apocalyptic number.

It is an amenable number.

77081220001 is a deficient number, since it is larger than the sum of its proper divisors (15442851).

77081220001 is a wasteful number, since it uses less digits than its factorization.

77081220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15442850.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 77081220001 its reverse (10002218077), we get a palindrome (87083438078).

The spelling of 77081220001 in words is "seventy-seven billion, eighty-one million, two hundred twenty thousand, one".