65661062772 has 24 divisors (see below), whose sum is σ = 153233387776. Its totient is φ = 21883557888.

The previous prime is 65661062767. The next prime is 65661062773. The reversal of 65661062772 is 27726016656.

It is a super-2 number, since 2×65661062772² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65661062773) by changing a digit.

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, 353293 + ... + 506100.

Almost surely, 2^65661062772 is an apocalyptic number.

It is an amenable number.

65661062772 is an abundant number, since it is smaller than the sum of its proper divisors (87572325004).

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

65661062772 is a wasteful number, since it uses less digits than its factorization.

65661062772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865767 (or 865765 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 65661062772 in words is "sixty-five billion, six hundred sixty-one million, sixty-two thousand, seven hundred seventy-two".