64018515561 has 96 divisors (see below), whose sum is σ = 122268513024. Its totient is φ = 28892160000.

The previous prime is 64018515559. The next prime is 64018515563. The reversal of 64018515561 is 16551581046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64018515559) and next prime (64018515563).

It is not a de Polignac number, because 64018515561 - 2¹ = 64018515559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64018515563) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 504561 + ... + 618561.

It is an arithmetic number, because the mean of its divisors is an integer number (1273630344).

Almost surely, 2^64018515561 is an apocalyptic number.

It is an amenable number.

64018515561 is a deficient number, since it is larger than the sum of its proper divisors (58249997463).

64018515561 is a wasteful number, since it uses less digits than its factorization.

64018515561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114063 (or 114052 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 64018515561 in words is "sixty-four billion, eighteen million, five hundred fifteen thousand, five hundred sixty-one".