65945399620 has 24 divisors (see below), whose sum is σ = 138549751704. Its totient is φ = 26365890816.

The previous prime is 65945399617. The next prime is 65945399659. The reversal of 65945399620 is 2699354956.

It can be written as a sum of positive squares in 4 ways, for example, as 180848704 + 65764550916 = 13448^2 + 256446^2 .

It is a super-2 number, since 2×65945399620² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722679 + ... + 808798.

It is an arithmetic number, because the mean of its divisors is an integer number (5772906321).

Almost surely, 2^65945399620 is an apocalyptic number.

It is an amenable number.

65945399620 is an abundant number, since it is smaller than the sum of its proper divisors (72604352084).

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

65945399620 is a wasteful number, since it uses less digits than its factorization.

65945399620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533639 (or 1533637 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 58.

The spelling of 65945399620 in words is "sixty-five billion, nine hundred forty-five million, three hundred ninety-nine thousand, six hundred twenty".