66051651 has 8 divisors (see below), whose sum is σ = 88487104. Its totient is φ = 43825320.

The previous prime is 66051637. The next prime is 66051659. The reversal of 66051651 is 15615066.

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

It is not a de Polignac number, because 66051651 - 2⁷ = 66051523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66051659) 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, 51541 + ... + 52806.

It is an arithmetic number, because the mean of its divisors is an integer number (11060888).

Almost surely, 2^66051651 is an apocalyptic number.

66051651 is a deficient number, since it is larger than the sum of its proper divisors (22435453).

66051651 is a wasteful number, since it uses less digits than its factorization.

66051651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104561.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66051651 is about 8127.2166822351. The cubic root of 66051651 is about 404.2293958303.

It can be divided in two parts, 6605 and 1651, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 66051651 in words is "sixty-six million, fifty-one thousand, six hundred fifty-one".