64266033640 has 64 divisors (see below), whose sum is σ = 153740054160. Its totient is φ = 24093818880.

The previous prime is 64266033617. The next prime is 64266033641. The reversal of 64266033640 is 4633066246.

It can be written as a sum of positive squares in 8 ways, for example, as 54991188004 + 9274845636 = 234502^2 + 96306^2 .

It is a super-2 number, since 2×64266033640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64266033593 and 64266033602.

It is not an unprimeable number, because it can be changed into a prime (64266033641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32197 + ... + 359956.

Almost surely, 2^64266033640 is an apocalyptic number.

It is an amenable number.

64266033640 is an abundant number, since it is smaller than the sum of its proper divisors (89474020520).

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

64266033640 is a wasteful number, since it uses less digits than its factorization.

64266033640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392422 (or 392418 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 40.

Adding to 64266033640 its reverse (4633066246), we get a palindrome (68899099886).

The spelling of 64266033640 in words is "sixty-four billion, two hundred sixty-six million, thirty-three thousand, six hundred forty".