667541453820 has 24 divisors (see below), whose sum is σ = 1869116070864. Its totient is φ = 178011054336.

The previous prime is 667541453807. The next prime is 667541453837. The reversal of 667541453820 is 28354145766.

It is a super-2 number, since 2×667541453820² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5562845389 + ... + 5562845508.

It is an arithmetic number, because the mean of its divisors is an integer number (77879836286).

Almost surely, 2^667541453820 is an apocalyptic number.

667541453820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667541453820 is an abundant number, since it is smaller than the sum of its proper divisors (1201574617044).

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

667541453820 is a wasteful number, since it uses less digits than its factorization.

667541453820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11125690909 (or 11125690907 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 667541453820 in words is "six hundred sixty-seven billion, five hundred forty-one million, four hundred fifty-three thousand, eight hundred twenty".