77840551460737 has 4 divisors (see below), whose sum is σ = 83828286188500. Its totient is φ = 71852816732976.

The previous prime is 77840551460723. The next prime is 77840551460761. The reversal of 77840551460737 is 73706415504877.

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 17834396240241 + 60006155220496 = 4223079^2 + 7746364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77840551460737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77840551460537) 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, 2993867363862 + ... + 2993867363887.

It is an arithmetic number, because the mean of its divisors is an integer number (20957071547125).

Almost surely, 2^{77840551460737} is an apocalyptic number.

It is an amenable number.

77840551460737 is a deficient number, since it is larger than the sum of its proper divisors (5987734727763).

77840551460737 is a wasteful number, since it uses less digits than its factorization.

77840551460737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5987734727762.

The product of its (nonzero) digits is 138297600, while the sum is 64.

The spelling of 77840551460737 in words is "seventy-seven trillion, eight hundred forty billion, five hundred fifty-one million, four hundred sixty thousand, seven hundred thirty-seven".