65643540253501 has 16 divisors (see below), whose sum is σ = 77609700835200. Its totient is φ = 54324586387008.

The previous prime is 65643540253471. The next prime is 65643540253507. The reversal of 65643540253501 is 10535204534656.

It is not a de Polignac number, because 65643540253501 - 2³⁵ = 65609180515133 is a prime.

It is a super-2 number, since 2×65643540253501² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65643540253507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6827586 + ... + 13338028.

It is an arithmetic number, because the mean of its divisors is an integer number (4850606302200).

Almost surely, 2^{65643540253501} is an apocalyptic number.

It is an amenable number.

65643540253501 is a deficient number, since it is larger than the sum of its proper divisors (11966160581699).

65643540253501 is a wasteful number, since it uses less digits than its factorization.

65643540253501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560148.

The product of its (nonzero) digits is 6480000, while the sum is 49.

The spelling of 65643540253501 in words is "sixty-five trillion, six hundred forty-three billion, five hundred forty million, two hundred fifty-three thousand, five hundred one".