66612501 has 12 divisors (see below), whose sum is σ = 96308940. Its totient is φ = 44366400.

The previous prime is 66612493. The next prime is 66612503. The reversal of 66612501 is 10521666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27562500 + 39050001 = 5250^2 + 6249^2 .

It is not a de Polignac number, because 66612501 - 2³ = 66612493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66612503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8865 + ... + 14553.

It is an arithmetic number, because the mean of its divisors is an integer number (8025745).

Almost surely, 2^66612501 is an apocalyptic number.

It is an amenable number.

66612501 is a deficient number, since it is larger than the sum of its proper divisors (29696439).

66612501 is a wasteful number, since it uses less digits than its factorization.

66612501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6996 (or 6993 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66612501 is about 8161.6481791364. The cubic root of 66612501 is about 405.3702877750.

The spelling of 66612501 in words is "sixty-six million, six hundred twelve thousand, five hundred one".