64021154450 has 54 divisors (see below), whose sum is σ = 130929118047. Its totient is φ = 23273263200.

The previous prime is 64021154447. The next prime is 64021154459. The reversal of 64021154450 is 5445112046.

It can be written as a sum of positive squares in 5 ways, for example, as 61185485449 + 2835669001 = 247357^2 + 53251^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=178915.

It is a super-2 number, since 2×64021154450² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64021154459) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19679024 + ... + 19682276.

Almost surely, 2^64021154450 is an apocalyptic number.

64021154450 is an abundant number, since it is smaller than the sum of its proper divisors (66907963597).

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

64021154450 is an equidigital number, since it uses as much as digits as its factorization.

64021154450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6540 (or 3271 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

Multiplying 64021154450 by its sum of digits (32), we get a square (2048676942400 = 1431320²).

Adding to 64021154450 its reverse (5445112046), we get a palindrome (69466266496).

The spelling of 64021154450 in words is "sixty-four billion, twenty-one million, one hundred fifty-four thousand, four hundred fifty".