65506378637 has 16 divisors (see below), whose sum is σ = 78218821632. Its totient is φ = 53638746480.

The previous prime is 65506378631. The next prime is 65506378643. The reversal of 65506378637 is 73687360556.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65506378631) and next prime (65506378643).

It is a cyclic number.

It is not a de Polignac number, because 65506378637 - 2¹⁰ = 65506377613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65506378631) 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, 131789 + ... + 385202.

It is an arithmetic number, because the mean of its divisors is an integer number (4888676352).

Almost surely, 2^65506378637 is an apocalyptic number.

It is an amenable number.

65506378637 is a deficient number, since it is larger than the sum of its proper divisors (12712442995).

65506378637 is a wasteful number, since it uses less digits than its factorization.

65506378637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517808.

The product of its (nonzero) digits is 19051200, while the sum is 56.

The spelling of 65506378637 in words is "sixty-five billion, five hundred six million, three hundred seventy-eight thousand, six hundred thirty-seven".