77681509306 has 8 divisors (see below), whose sum is σ = 116538386580. Its totient is φ = 38835380448.

The previous prime is 77681509277. The next prime is 77681509313. The reversal of 77681509306 is 60390518677.

It can be written as a sum of positive squares in 2 ways, for example, as 63778977025 + 13902532281 = 252545^2 + 117909^2 .

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

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, 2669011 + ... + 2697958.

Almost surely, 2^77681509306 is an apocalyptic number.

77681509306 is a deficient number, since it is larger than the sum of its proper divisors (38856877274).

77681509306 is a wasteful number, since it uses less digits than its factorization.

77681509306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374208.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 77681509306 in words is "seventy-seven billion, six hundred eighty-one million, five hundred nine thousand, three hundred six".