66552501 has 16 divisors (see below), whose sum is σ = 98043264. Its totient is φ = 39942144.

The previous prime is 66552487. The next prime is 66552511. The reversal of 66552501 is 10525566.

It is not a de Polignac number, because 66552501 - 2⁵ = 66552469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552511) 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, 27196 + ... + 29541.

It is an arithmetic number, because the mean of its divisors is an integer number (6127704).

Almost surely, 2^66552501 is an apocalyptic number.

It is an amenable number.

66552501 is a deficient number, since it is larger than the sum of its proper divisors (31490763).

66552501 is a wasteful number, since it uses less digits than its factorization.

66552501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56780.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 66552501 is about 8157.9716228974. The cubic root of 66552501 is about 405.2485412402.

The spelling of 66552501 in words is "sixty-six million, five hundred fifty-two thousand, five hundred one".