65506506611557 has 16 divisors (see below), whose sum is σ = 71486000337600. Its totient is φ = 59531074986240.

The previous prime is 65506506611521. The next prime is 65506506611563. The reversal of 65506506611557 is 75511660560556.

It is a happy number.

It is not a de Polignac number, because 65506506611557 - 2²⁷ = 65506372393829 is a prime.

It is a super-2 number, since 2×65506506611557² (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 (65506506611057) 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, 570571683 + ... + 570686479.

It is an arithmetic number, because the mean of its divisors is an integer number (4467875021100).

Almost surely, 2^{65506506611557} is an apocalyptic number.

It is an amenable number.

65506506611557 is a deficient number, since it is larger than the sum of its proper divisors (5979493726043).

65506506611557 is a wasteful number, since it uses less digits than its factorization.

65506506611557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132036.

The product of its (nonzero) digits is 28350000, while the sum is 58.

The spelling of 65506506611557 in words is "sixty-five trillion, five hundred six billion, five hundred six million, six hundred eleven thousand, five hundred fifty-seven".