65421623519 has 16 divisors (see below), whose sum is σ = 77579976768. Its totient is φ = 53997622272.

The previous prime is 65421623513. The next prime is 65421623569. The reversal of 65421623519 is 91532612456.

It is a cyclic number.

It is not a de Polignac number, because 65421623519 - 2⁴ = 65421623503 is a prime.

It is a super-2 number, since 2×65421623519² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65421623519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421623513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1276904 + ... + 1327149.

It is an arithmetic number, because the mean of its divisors is an integer number (4848748548).

Almost surely, 2^65421623519 is an apocalyptic number.

65421623519 is a deficient number, since it is larger than the sum of its proper divisors (12158353249).

65421623519 is a wasteful number, since it uses less digits than its factorization.

65421623519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604194.

The product of its digits is 388800, while the sum is 44.

The spelling of 65421623519 in words is "sixty-five billion, four hundred twenty-one million, six hundred twenty-three thousand, five hundred nineteen".