665719853760 has 896 divisors, whose sum is σ = 2734558310400. Its totient is φ = 151031070720.

The previous prime is 665719853719. The next prime is 665719853801. The reversal of 665719853760 is 67358917566.

665719853760 is a `hidden beast` number, since 6 + 6 + 5 + 7 + 1 + 98 + 537 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (665719853719) and next prime (665719853801).

It is a super-2 number, since 2×665719853760² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 78956745 + ... + 78965175.

It is an arithmetic number, because the mean of its divisors is an integer number (3051962400).

Almost surely, 2^665719853760 is an apocalyptic number.

665719853760 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 665719853760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367279155200).

665719853760 is an abundant number, since it is smaller than the sum of its proper divisors (2068838456640).

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

665719853760 is a wasteful number, since it uses less digits than its factorization.

665719853760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526 (or 8510 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 63.

The spelling of 665719853760 in words is "six hundred sixty-five billion, seven hundred nineteen million, eight hundred fifty-three thousand, seven hundred sixty".