66251077272 has 96 divisors (see below), whose sum is σ = 184838656080. Its totient is φ = 21421635840.

The previous prime is 66251077271. The next prime is 66251077273. The reversal of 66251077272 is 27277015266.

66251077272 is a `hidden beast` number, since 6 + 62 + 510 + 7 + 7 + 2 + 72 = 666.

It is an interprime number because it is at equal distance from previous prime (66251077271) and next prime (66251077273).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66251077271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 844218 + ... + 919350.

Almost surely, 2^66251077272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66251077272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92419328040).

66251077272 is an abundant number, since it is smaller than the sum of its proper divisors (118587578808).

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

66251077272 is a wasteful number, since it uses less digits than its factorization.

66251077272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75513 (or 75506 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 66251077272 in words is "sixty-six billion, two hundred fifty-one million, seventy-seven thousand, two hundred seventy-two".