667997111520 has 960 divisors, whose sum is σ = 2507806490112. Its totient is φ = 167215104000.

The previous prime is 667997111477. The next prime is 667997111603. The reversal of 667997111520 is 25111799766.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 2377213780 + ... + 2377214060.

Almost surely, 2^667997111520 is an apocalyptic number.

667997111520 is a gapful number since it is divisible by the number (60) 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 667997111520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253903245056).

667997111520 is an abundant number, since it is smaller than the sum of its proper divisors (1839809378592).

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

667997111520 is a wasteful number, since it uses less digits than its factorization.

667997111520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 54.

The spelling of 667997111520 in words is "six hundred sixty-seven billion, nine hundred ninety-seven million, one hundred eleven thousand, five hundred twenty".