78293698561 has 8 divisors (see below), whose sum is σ = 87223749480. Its totient is φ = 69778998912.

The previous prime is 78293698493. The next prime is 78293698589. The reversal of 78293698561 is 16589639287.

It can be written as a sum of positive squares in 4 ways, for example, as 13035930625 + 65257767936 = 114175^2 + 255456^2 .

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 78293698561 - 2¹⁷ = 78293567489 is a prime.

It is a super-2 number, since 2×78293698561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78293698493 and 78293698502.

It is not an unprimeable number, because it can be changed into a prime (78293698591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103837420 + ... + 103838173.

It is an arithmetic number, because the mean of its divisors is an integer number (10902968685).

Almost surely, 2^78293698561 is an apocalyptic number.

It is an amenable number.

78293698561 is a deficient number, since it is larger than the sum of its proper divisors (8930050919).

78293698561 is a wasteful number, since it uses less digits than its factorization.

78293698561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207675635.

The product of its digits is 39191040, while the sum is 64.

The spelling of 78293698561 in words is "seventy-eight billion, two hundred ninety-three million, six hundred ninety-eight thousand, five hundred sixty-one".