77145745205321 has 8 divisors (see below), whose sum is σ = 83123599152384. Its totient is φ = 71174114951760.

The previous prime is 77145745205297. The next prime is 77145745205323. The reversal of 77145745205321 is 12350254754177.

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 77145745205321 - 2¹⁴ = 77145745188937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77145745205323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1555897625 + ... + 1555947206.

It is an arithmetic number, because the mean of its divisors is an integer number (10390449894048).

Almost surely, 2^{77145745205321} is an apocalyptic number.

It is an amenable number.

77145745205321 is a deficient number, since it is larger than the sum of its proper divisors (5977853947063).

77145745205321 is a wasteful number, since it uses less digits than its factorization.

77145745205321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111846751.

The product of its (nonzero) digits is 8232000, while the sum is 53.

Adding to 77145745205321 its reverse (12350254754177), we get a palindrome (89495999959498).

The spelling of 77145745205321 in words is "seventy-seven trillion, one hundred forty-five billion, seven hundred forty-five million, two hundred five thousand, three hundred twenty-one".