64134553515 has 32 divisors (see below), whose sum is σ = 112156379136. Its totient is φ = 31154542080.

The previous prime is 64134553487. The next prime is 64134553517. The reversal of 64134553515 is 51535543146.

It is a happy number.

It is not a de Polignac number, because 64134553515 - 2¹⁸ = 64134291371 is a prime.

It is a super-2 number, since 2×64134553515² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64134553517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4048677 + ... + 4064486.

It is an arithmetic number, because the mean of its divisors is an integer number (3504886848).

Almost surely, 2^64134553515 is an apocalyptic number.

64134553515 is a deficient number, since it is larger than the sum of its proper divisors (48021825621).

64134553515 is a wasteful number, since it uses less digits than its factorization.

64134553515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113219.

The product of its digits is 540000, while the sum is 42.

The spelling of 64134553515 in words is "sixty-four billion, one hundred thirty-four million, five hundred fifty-three thousand, five hundred fifteen".