77777400001 has 16 divisors (see below), whose sum is σ = 92767555584. Its totient is φ = 63757918224.

The previous prime is 77777399983. The next prime is 77777400079. The reversal of 77777400001 is 10000477777.

It is a happy number.

It is not a de Polignac number, because 77777400001 - 2¹¹ = 77777397953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77777400091) 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 15 ways as a sum of consecutive naturals, for example, 1113556 + ... + 1181338.

It is an arithmetic number, because the mean of its divisors is an integer number (5797972224).

Almost surely, 2^77777400001 is an apocalyptic number.

It is an amenable number.

77777400001 is a deficient number, since it is larger than the sum of its proper divisors (14990155583).

77777400001 is a wasteful number, since it uses less digits than its factorization.

77777400001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74940.

The product of its (nonzero) digits is 67228, while the sum is 40.

Adding to 77777400001 its reverse (10000477777), we get a palindrome (87777877778).

The spelling of 77777400001 in words is "seventy-seven billion, seven hundred seventy-seven million, four hundred thousand, one".