65249021772 has 96 divisors (see below), whose sum is σ = 190906329600. Its totient is φ = 19090612800.

The previous prime is 65249021771. The next prime is 65249021833. The reversal of 65249021772 is 27712094256.

It is a super-3 number, since 3×65249021772³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (65249021771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 912504 + ... + 981407.

It is an arithmetic number, because the mean of its divisors is an integer number (1988607600).

Almost surely, 2^65249021772 is an apocalyptic number.

It is an amenable number.

65249021772 is an abundant number, since it is smaller than the sum of its proper divisors (125657307828).

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

65249021772 is a wasteful number, since it uses less digits than its factorization.

65249021772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893964 (or 1893956 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 65249021772 in words is "sixty-five billion, two hundred forty-nine million, twenty-one thousand, seven hundred seventy-two".