64151515 has 4 divisors (see below), whose sum is σ = 76981824. Its totient is φ = 51321208.

The previous prime is 64151501. The next prime is 64151519. The reversal of 64151515 is 51515146.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64151515 - 2¹¹ = 64149467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64151519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6415147 + ... + 6415156.

It is an arithmetic number, because the mean of its divisors is an integer number (19245456).

Almost surely, 2^64151515 is an apocalyptic number.

64151515 is a deficient number, since it is larger than the sum of its proper divisors (12830309).

64151515 is a wasteful number, since it uses less digits than its factorization.

64151515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830308.

The product of its digits is 3000, while the sum is 28.

The square root of 64151515 is about 8009.4640894382. The cubic root of 64151515 is about 400.3154074799.

It can be divided in two parts, 6 and 4151515, that added together give a triangular number (4151521 = T₂₈₈₁).

The spelling of 64151515 in words is "sixty-four million, one hundred fifty-one thousand, five hundred fifteen".