66212556448560 has 80 divisors (see below), whose sum is σ = 217332979415136. Its totient is φ = 16618053382144.

The previous prime is 66212556448501. The next prime is 66212556448561. The reversal of 66212556448560 is 6584465521266.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 66212556448494 and 66212556448503.

It is not an unprimeable number, because it can be changed into a prime (66212556448561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8114279799 + ... + 8114287958.

Almost surely, 2^{66212556448560} is an apocalyptic number.

66212556448560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66212556448560 is an abundant number, since it is smaller than the sum of its proper divisors (151120422966576).

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

66212556448560 is a wasteful number, since it uses less digits than its factorization.

66212556448560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16228567790 (or 16228567784 counting only the distinct ones).

The product of its (nonzero) digits is 82944000, while the sum is 60.

The spelling of 66212556448560 in words is "sixty-six trillion, two hundred twelve billion, five hundred fifty-six million, four hundred forty-eight thousand, five hundred sixty".