65947891608 has 32 divisors (see below), whose sum is σ = 183188588400. Its totient is φ = 21982630464.

The previous prime is 65947891591. The next prime is 65947891609. The reversal of 65947891608 is 80619874956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65947891609) 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, 152656941 + ... + 152657372.

Almost surely, 2^65947891608 is an apocalyptic number.

It is an amenable number.

65947891608 is an abundant number, since it is smaller than the sum of its proper divisors (117240696792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65947891608 is a wasteful number, since it uses less digits than its factorization.

65947891608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305314328 (or 305314318 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 65947891608 in words is "sixty-five billion, nine hundred forty-seven million, eight hundred ninety-one thousand, six hundred eight".