77730734645 has 8 divisors (see below), whose sum is σ = 93367184856. Its totient is φ = 62124385536.

The previous prime is 77730734623. The next prime is 77730734659. The reversal of 77730734645 is 54643703777.

It can be written as a sum of positive squares in 4 ways, for example, as 39705344644 + 38025390001 = 199262^2 + 195001^2 .

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 77730734645 - 2¹⁰ = 77730733621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7519592 + ... + 7529921.

It is an arithmetic number, because the mean of its divisors is an integer number (11670898107).

Almost surely, 2^77730734645 is an apocalyptic number.

It is an amenable number.

77730734645 is a deficient number, since it is larger than the sum of its proper divisors (15636450211).

77730734645 is a wasteful number, since it uses less digits than its factorization.

77730734645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15050551.

The product of its (nonzero) digits is 10372320, while the sum is 53.

The spelling of 77730734645 in words is "seventy-seven billion, seven hundred thirty million, seven hundred thirty-four thousand, six hundred forty-five".