77900222001 has 24 divisors (see below), whose sum is σ = 120835385280. Its totient is φ = 44510525472.

The previous prime is 77900221991. The next prime is 77900222021. The reversal of 77900222001 is 10022200977.

It is a happy number.

It is not a de Polignac number, because 77900222001 - 2⁵ = 77900221969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77900222001.

It is not an unprimeable number, because it can be changed into a prime (77900222021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3045895 + ... + 3071363.

It is an arithmetic number, because the mean of its divisors is an integer number (5034807720).

Almost surely, 2^77900222001 is an apocalyptic number.

It is an amenable number.

77900222001 is a deficient number, since it is larger than the sum of its proper divisors (42935163279).

77900222001 is a wasteful number, since it uses less digits than its factorization.

77900222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46293 (or 46286 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

Adding to 77900222001 its reverse (10022200977), we get a palindrome (87922422978).

The spelling of 77900222001 in words is "seventy-seven billion, nine hundred million, two hundred twenty-two thousand, one".