66520465 has 8 divisors (see below), whose sum is σ = 87081408. Its totient is φ = 48378480.

The previous prime is 66520427. The next prime is 66520471. The reversal of 66520465 is 56402566.

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

It is not a de Polignac number, because 66520465 - 2⁹ = 66519953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66520465.

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, 604677 + ... + 604786.

It is an arithmetic number, because the mean of its divisors is an integer number (10885176).

Almost surely, 2^66520465 is an apocalyptic number.

It is an amenable number.

66520465 is a deficient number, since it is larger than the sum of its proper divisors (20560943).

66520465 is a wasteful number, since it uses less digits than its factorization.

66520465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209479.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 66520465 is about 8156.0079082845. The cubic root of 66520465 is about 405.1835067399.

The spelling of 66520465 in words is "sixty-six million, five hundred twenty thousand, four hundred sixty-five".