65166505 has 8 divisors (see below), whose sum is σ = 78652872. Its totient is φ = 51831168.

The previous prime is 65166481. The next prime is 65166511. The reversal of 65166505 is 50566156.

It can be written as a sum of positive squares in 4 ways, for example, as 19900521 + 45265984 = 4461^2 + 6728^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65166505 - 2¹⁵ = 65133737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36804 + ... + 38533.

It is an arithmetic number, because the mean of its divisors is an integer number (9831609).

Almost surely, 2^65166505 is an apocalyptic number.

It is an amenable number.

65166505 is a deficient number, since it is larger than the sum of its proper divisors (13486367).

65166505 is a wasteful number, since it uses less digits than its factorization.

65166505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75515.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65166505 is about 8072.5773455570. The cubic root of 65166505 is about 402.4156015575.

The spelling of 65166505 in words is "sixty-five million, one hundred sixty-six thousand, five hundred five".