66452112540 has 72 divisors (see below), whose sum is σ = 219896088048. Its totient is φ = 16109602560.

The previous prime is 66452112539. The next prime is 66452112547. The reversal of 66452112540 is 4521125466.

66452112540 is a `hidden beast` number, since 6 + 6 + 4 + 521 + 125 + 4 + 0 = 666.

It is a super-2 number, since 2×66452112540² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66452112495 and 66452112504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66452112547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16778857 + ... + 16782816.

It is an arithmetic number, because the mean of its divisors is an integer number (3054112334).

Almost surely, 2^66452112540 is an apocalyptic number.

66452112540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66452112540 is an abundant number, since it is smaller than the sum of its proper divisors (153443975508).

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

66452112540 is a wasteful number, since it uses less digits than its factorization.

66452112540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33561699 (or 33561694 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

It can be divided in two parts, 6 and 6452112540, that added together give a palindrome (6452112546).

The spelling of 66452112540 in words is "sixty-six billion, four hundred fifty-two million, one hundred twelve thousand, five hundred forty".