64119491436 has 384 divisors, whose sum is σ = 208753735680. Its totient is φ = 14780620800.

The previous prime is 64119491431. The next prime is 64119491467. The reversal of 64119491436 is 63419491146.

It is a super-2 number, since 2×64119491436² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64119491431) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 39554706 + ... + 39556326.

It is an arithmetic number, because the mean of its divisors is an integer number (543629520).

Almost surely, 2^64119491436 is an apocalyptic number.

64119491436 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64119491436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104376867840).

64119491436 is an abundant number, since it is smaller than the sum of its proper divisors (144634244244).

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

64119491436 is a wasteful number, since it uses less digits than its factorization.

64119491436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785 (or 1783 counting only the distinct ones).

The product of its digits is 559872, while the sum is 48.

It can be divided in two parts, 64119 and 491436, that added together give a palindrome (555555).

The spelling of 64119491436 in words is "sixty-four billion, one hundred nineteen million, four hundred ninety-one thousand, four hundred thirty-six".