66212005501 has 8 divisors (see below), whose sum is σ = 70134059520. Its totient is φ = 62292977088.

The previous prime is 66212005499. The next prime is 66212005583. The reversal of 66212005501 is 10550021266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66212005501 - 2¹ = 66212005499 is a prime.

It is a super-2 number, since 2×66212005501² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66212005501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66212002501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 711261 + ... + 798946.

It is an arithmetic number, because the mean of its divisors is an integer number (8766757440).

Almost surely, 2^66212005501 is an apocalyptic number.

It is an amenable number.

66212005501 is a deficient number, since it is larger than the sum of its proper divisors (3922054019).

66212005501 is a wasteful number, since it uses less digits than its factorization.

66212005501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512803.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 66212005501 its reverse (10550021266), we get a palindrome (76762026767).

The spelling of 66212005501 in words is "sixty-six billion, two hundred twelve million, five thousand, five hundred one".