65166055551 has 16 divisors (see below), whose sum is σ = 96885882720. Its totient is φ = 43289426880.

The previous prime is 65166055547. The next prime is 65166055583. The reversal of 65166055551 is 15555066156.

It is not a de Polignac number, because 65166055551 - 2² = 65166055547 is a prime.

It is a super-2 number, since 2×65166055551² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65166055497 and 65166055506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65166055531) 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, 4287000 + ... + 4302173.

It is an arithmetic number, because the mean of its divisors is an integer number (6055367670).

Almost surely, 2^65166055551 is an apocalyptic number.

65166055551 is a deficient number, since it is larger than the sum of its proper divisors (31719827169).

65166055551 is a wasteful number, since it uses less digits than its factorization.

65166055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8589463 (or 8589457 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 65166055551 in words is "sixty-five billion, one hundred sixty-six million, fifty-five thousand, five hundred fifty-one".