78354024561 has 12 divisors (see below), whose sum is σ = 113618420292. Its totient is φ = 52032761856.

The previous prime is 78354024559. The next prime is 78354024563. The reversal of 78354024561 is 16542045387.

78354024561 is a `hidden beast` number, since 7 + 8 + 3 + 540 + 2 + 45 + 61 = 666.

It is an interprime number because it is at equal distance from previous prime (78354024559) and next prime (78354024563).

It can be written as a sum of positive squares in 2 ways, for example, as 50005904400 + 28348120161 = 223620^2 + 168369^2 .

It is not a de Polignac number, because 78354024561 - 2¹ = 78354024559 is a prime.

It is a super-2 number, since 2×78354024561² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78354024563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16935436 + ... + 16940061.

It is an arithmetic number, because the mean of its divisors is an integer number (9468201691).

Almost surely, 2^78354024561 is an apocalyptic number.

It is an amenable number.

78354024561 is a deficient number, since it is larger than the sum of its proper divisors (35264395731).

78354024561 is a wasteful number, since it uses less digits than its factorization.

78354024561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33875760 (or 33875757 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 78354024561 in words is "seventy-eight billion, three hundred fifty-four million, twenty-four thousand, five hundred sixty-one".