66520501 has 8 divisors (see below), whose sum is σ = 70643520. Its totient is φ = 62459712.

The previous prime is 66520499. The next prime is 66520511. The reversal of 66520501 is 10502566.

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 66520501 - 2¹ = 66520499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66520511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13345 + ... + 17638.

It is an arithmetic number, because the mean of its divisors is an integer number (8830440).

Almost surely, 2^66520501 is an apocalyptic number.

It is an amenable number.

66520501 is a deficient number, since it is larger than the sum of its proper divisors (4123019).

66520501 is a wasteful number, since it uses less digits than its factorization.

66520501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31115.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66520501 is about 8156.0101152463. The cubic root of 66520501 is about 405.1835798332.

The spelling of 66520501 in words is "sixty-six million, five hundred twenty thousand, five hundred one".