123456777901 has 8 divisors (see below), whose sum is σ = 127119409560. Its totient is φ = 119811302208.

The previous prime is 123456777893. The next prime is 123456777911. The reversal of 123456777901 is 109777654321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37461215401 + 85995562500 = 193549^2 + 293250^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123456777901 - 2³ = 123456777893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123456777911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4274386 + ... + 4303171.

It is an arithmetic number, because the mean of its divisors is an integer number (15889926195).

Almost surely, 2^123456777901 is an apocalyptic number.

It is an amenable number.

123456777901 is a deficient number, since it is larger than the sum of its proper divisors (3662631659).

123456777901 is an equidigital number, since it uses as much as digits as its factorization.

123456777901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577983.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 123456777901 in words is "one hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-seven thousand, nine hundred one".