667653532780 has 144 divisors (see below), whose sum is σ = 1602401875200. Its totient is φ = 232918882560.

The previous prime is 667653532771. The next prime is 667653532781. The reversal of 667653532780 is 87235356766.

It is a super-2 number, since 2×667653532780² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667653532781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24325665 + ... + 24353095.

It is an arithmetic number, because the mean of its divisors is an integer number (11127790800).

Almost surely, 2^667653532780 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 667653532780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801200937600).

667653532780 is an abundant number, since it is smaller than the sum of its proper divisors (934748342420).

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

667653532780 is a wasteful number, since it uses less digits than its factorization.

667653532780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27864 (or 27849 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 58.

The spelling of 667653532780 in words is "six hundred sixty-seven billion, six hundred fifty-three million, five hundred thirty-two thousand, seven hundred eighty".