77145431333 has 4 divisors (see below), whose sum is σ = 81683397900. Its totient is φ = 72607464768.

The previous prime is 77145431329. The next prime is 77145431339. The reversal of 77145431333 is 33313454177.

It is a happy number.

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 44987258404 + 32158172929 = 212102^2 + 179327^2 .

It is a cyclic number.

It is not a de Polignac number, because 77145431333 - 2² = 77145431329 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 (77145431339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2268983258 + ... + 2268983291.

It is an arithmetic number, because the mean of its divisors is an integer number (20420849475).

Almost surely, 2^77145431333 is an apocalyptic number.

It is an amenable number.

77145431333 is a deficient number, since it is larger than the sum of its proper divisors (4537966567).

77145431333 is a wasteful number, since it uses less digits than its factorization.

77145431333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537966566.

The product of its digits is 317520, while the sum is 41.

The spelling of 77145431333 in words is "seventy-seven billion, one hundred forty-five million, four hundred thirty-one thousand, three hundred thirty-three".