78406530361 has 8 divisors (see below), whose sum is σ = 78667079400. Its totient is φ = 78146045952.

The previous prime is 78406530353. The next prime is 78406530373. The reversal of 78406530361 is 16303560487.

It can be written as a sum of positive squares in 4 ways, for example, as 18212852025 + 60193678336 = 134955^2 + 245344^2 .

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 78406530361 - 2³ = 78406530353 is a prime.

It is a super-2 number, since 2×78406530361² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78406530661) 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, 4262961 + ... + 4281313.

It is an arithmetic number, because the mean of its divisors is an integer number (9833384925).

Almost surely, 2^78406530361 is an apocalyptic number.

It is an amenable number.

78406530361 is a deficient number, since it is larger than the sum of its proper divisors (260549039).

78406530361 is a wasteful number, since it uses less digits than its factorization.

78406530361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32315.

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 78406530361 in words is "seventy-eight billion, four hundred six million, five hundred thirty thousand, three hundred sixty-one".