77803870145 has 8 divisors (see below), whose sum is σ = 93662935656. Its totient is φ = 62044235136.

The previous prime is 77803870121. The next prime is 77803870169. The reversal of 77803870145 is 54107830877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77803870121) and next prime (77803870169).

It can be written as a sum of positive squares in 4 ways, for example, as 12598715536 + 65205154609 = 112244^2 + 255353^2 .

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 77803870145 - 2¹⁶ = 77803804609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77803870093 and 77803870102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24855902 + ... + 24859031.

It is an arithmetic number, because the mean of its divisors is an integer number (11707866957).

Almost surely, 2^77803870145 is an apocalyptic number.

It is an amenable number.

77803870145 is a deficient number, since it is larger than the sum of its proper divisors (15859065511).

77803870145 is a wasteful number, since it uses less digits than its factorization.

77803870145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49715251.

The product of its (nonzero) digits is 1317120, while the sum is 50.

The spelling of 77803870145 in words is "seventy-seven billion, eight hundred three million, eight hundred seventy thousand, one hundred forty-five".