64151665 has 8 divisors (see below), whose sum is σ = 77744808. Its totient is φ = 50812800.

The previous prime is 64151653. The next prime is 64151699. The reversal of 64151665 is 56615146.

It is a happy number.

64151665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 32353344 + 31798321 = 5688^2 + 5639^2 .

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

It is not a de Polignac number, because 64151665 - 2⁷ = 64151537 is a prime.

It is a super-2 number, since 2×64151665² = 8230872244544450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64151665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63012 + ... + 64021.

It is an arithmetic number, because the mean of its divisors is an integer number (9718101).

Almost surely, 2^64151665 is an apocalyptic number.

It is an amenable number.

64151665 is a deficient number, since it is larger than the sum of its proper divisors (13593143).

64151665 is a wasteful number, since it uses less digits than its factorization.

64151665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127139.

The product of its digits is 21600, while the sum is 34.

The square root of 64151665 is about 8009.4734533551. The cubic root of 64151665 is about 400.3157194874.

The spelling of 64151665 in words is "sixty-four million, one hundred fifty-one thousand, six hundred sixty-five".