66001601651 has 8 divisors (see below), whose sum is σ = 66692171280. Its totient is φ = 65311239168.

The previous prime is 66001601641. The next prime is 66001601663. The reversal of 66001601651 is 15610610066.

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

It is not a de Polignac number, because 66001601651 - 2²² = 65997407347 is a prime.

It is a super-2 number, since 2×66001601651² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66001601641) 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, 636320 + ... + 732738.

It is an arithmetic number, because the mean of its divisors is an integer number (8336521410).

Almost surely, 2^66001601651 is an apocalyptic number.

66001601651 is a deficient number, since it is larger than the sum of its proper divisors (690569629).

66001601651 is an equidigital number, since it uses as much as digits as its factorization.

66001601651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103573.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 66001601651 in words is "sixty-six billion, one million, six hundred one thousand, six hundred fifty-one".