65689967986 has 8 divisors (see below), whose sum is σ = 98536162140. Its totient is φ = 32844580608.

The previous prime is 65689967983. The next prime is 65689968049. The reversal of 65689967986 is 68976998656.

It can be written as a sum of positive squares in 2 ways, for example, as 52083911961 + 13606056025 = 228219^2 + 116645^2 .

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

It is not an unprimeable number, because it can be changed into a prime (65689967983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81250 + ... + 371458.

Almost surely, 2^65689967986 is an apocalyptic number.

65689967986 is a deficient number, since it is larger than the sum of its proper divisors (32846194154).

65689967986 is a wasteful number, since it uses less digits than its factorization.

65689967986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403388.

The product of its digits is 2116316160, while the sum is 79.

The spelling of 65689967986 in words is "sixty-five billion, six hundred eighty-nine million, nine hundred sixty-seven thousand, nine hundred eighty-six".