66697551360 has 1080 divisors, whose sum is σ = 276167353176. Its totient is φ = 15318097920.

The previous prime is 66697551359. The next prime is 66697551373. The reversal of 66697551360 is 6315579666.

It is a tau number, because it is divible by the number of its divisors (1080).

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

It is a junction number, because it is equal to n+sod(n) for n = 66697551297 and 66697551306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 3510397431 + ... + 3510397449.

Almost surely, 2^66697551360 is an apocalyptic number.

66697551360 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 66697551360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138083676588).

66697551360 is an abundant number, since it is smaller than the sum of its proper divisors (209469801816).

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

66697551360 is an frugal number, since it uses more digits than its factorization.

66697551360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 6123600, while the sum is 54.

The spelling of 66697551360 in words is "sixty-six billion, six hundred ninety-seven million, five hundred fifty-one thousand, three hundred sixty".