66551651 has 8 divisors (see below), whose sum is σ = 72185904. Its totient is φ = 61108480.

The previous prime is 66551647. The next prime is 66551657. The reversal of 66551651 is 15615566.

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 66551651 - 2² = 66551647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66551657) 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, 47045 + ... + 48438.

It is an arithmetic number, because the mean of its divisors is an integer number (9023238).

Almost surely, 2^66551651 is an apocalyptic number.

66551651 is a deficient number, since it is larger than the sum of its proper divisors (5634253).

66551651 is a wasteful number, since it uses less digits than its factorization.

66551651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95541.

The product of its digits is 27000, while the sum is 35.

The square root of 66551651 is about 8157.9195264479. The cubic root of 66551651 is about 405.2468159720.

The spelling of 66551651 in words is "sixty-six million, five hundred fifty-one thousand, six hundred fifty-one".