64523415516 has 192 divisors, whose sum is σ = 184345362432. Its totient is φ = 17166175488.

The previous prime is 64523415511. The next prime is 64523415529. The reversal of 64523415516 is 61551432546.

It is a super-2 number, since 2×64523415516² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64523415511) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17886585 + ... + 17890191.

It is an arithmetic number, because the mean of its divisors is an integer number (960132096).

Almost surely, 2^64523415516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64523415516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92172681216).

64523415516 is an abundant number, since it is smaller than the sum of its proper divisors (119821946916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64523415516 is a wasteful number, since it uses less digits than its factorization.

64523415516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888 (or 3886 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The spelling of 64523415516 in words is "sixty-four billion, five hundred twenty-three million, four hundred fifteen thousand, five hundred sixteen".