65721254023 has 16 divisors (see below), whose sum is σ = 70616992320. Its totient is φ = 60941776896.

The previous prime is 65721254017. The next prime is 65721254041. The reversal of 65721254023 is 32045212756.

It is a cyclic number.

It is not a de Polignac number, because 65721254023 - 2²⁵ = 65687699591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65721254083) 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 15 ways as a sum of consecutive naturals, for example, 1134558 + ... + 1191076.

It is an arithmetic number, because the mean of its divisors is an integer number (4413562020).

Almost surely, 2^65721254023 is an apocalyptic number.

65721254023 is a deficient number, since it is larger than the sum of its proper divisors (4895738297).

65721254023 is a wasteful number, since it uses less digits than its factorization.

65721254023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57546.

The product of its (nonzero) digits is 100800, while the sum is 37.

Adding to 65721254023 its reverse (32045212756), we get a palindrome (97766466779).

The spelling of 65721254023 in words is "sixty-five billion, seven hundred twenty-one million, two hundred fifty-four thousand, twenty-three".