78204680234666 has 8 divisors (see below), whose sum is σ = 117724483058724. Its totient is φ = 38963185881760.

The previous prime is 78204680234633. The next prime is 78204680234677. The reversal of 78204680234666 is 66643208640287.

It can be written as a sum of positive squares in 2 ways, for example, as 77755272231025 + 449408003641 = 8817895^2 + 670379^2 .

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

It is a super-2 number, since 2×78204680234666² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78204680234599 and 78204680234608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69577117085 + ... + 69577118208.

Almost surely, 2^{78204680234666} is an apocalyptic number.

78204680234666 is a deficient number, since it is larger than the sum of its proper divisors (39519802824058).

78204680234666 is a wasteful number, since it uses less digits than its factorization.

78204680234666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139154235576.

The product of its (nonzero) digits is 111476736, while the sum is 62.

The spelling of 78204680234666 in words is "seventy-eight trillion, two hundred four billion, six hundred eighty million, two hundred thirty-four thousand, six hundred sixty-six".