78558542161 has 8 divisors (see below), whose sum is σ = 86663152800. Its totient is φ = 70614419040.

The previous prime is 78558542143. The next prime is 78558542173. The reversal of 78558542161 is 16124585587.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78558542161 - 2¹³ = 78558533969 is a prime.

It is a super-2 number, since 2×78558542161² (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 = 78558542099 and 78558542108.

It is not an unprimeable number, because it can be changed into a prime (78558542141) 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, 40120851 + ... + 40122808.

It is an arithmetic number, because the mean of its divisors is an integer number (10832894100).

Almost surely, 2^78558542161 is an apocalyptic number.

It is an amenable number.

78558542161 is a deficient number, since it is larger than the sum of its proper divisors (8104610639).

78558542161 is a wasteful number, since it uses less digits than its factorization.

78558542161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80243759.

The product of its digits is 2688000, while the sum is 52.

The spelling of 78558542161 in words is "seventy-eight billion, five hundred fifty-eight million, five hundred forty-two thousand, one hundred sixty-one".