77970658345 has 4 divisors (see below), whose sum is σ = 93564790020. Its totient is φ = 62376526672.

The previous prime is 77970658343. The next prime is 77970658351. The reversal of 77970658345 is 54385607977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54385607977 = 10243 ⋅5309539.

It can be written as a sum of positive squares in 2 ways, for example, as 27008950336 + 50961708009 = 164344^2 + 225747^2 .

It is a cyclic number.

It is not a de Polignac number, because 77970658345 - 2¹ = 77970658343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77970658343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7797065830 + ... + 7797065839.

It is an arithmetic number, because the mean of its divisors is an integer number (23391197505).

Almost surely, 2^77970658345 is an apocalyptic number.

It is an amenable number.

77970658345 is a deficient number, since it is larger than the sum of its proper divisors (15594131675).

77970658345 is a wasteful number, since it uses less digits than its factorization.

77970658345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15594131674.

The product of its (nonzero) digits is 44452800, while the sum is 61.

The spelling of 77970658345 in words is "seventy-seven billion, nine hundred seventy million, six hundred fifty-eight thousand, three hundred forty-five".