66721475503 has 8 divisors (see below), whose sum is σ = 68279119568. Its totient is φ = 65164103424.

The previous prime is 66721475459. The next prime is 66721475519. The reversal of 66721475503 is 30557412766.

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 66721475503 - 2¹³ = 66721467311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66721415503) 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, 479125 + ... + 602497.

It is an arithmetic number, because the mean of its divisors is an integer number (8534889946).

Almost surely, 2^66721475503 is an apocalyptic number.

66721475503 is a deficient number, since it is larger than the sum of its proper divisors (1557644065).

66721475503 is a wasteful number, since it uses less digits than its factorization.

66721475503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135993.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 66721475503 in words is "sixty-six billion, seven hundred twenty-one million, four hundred seventy-five thousand, five hundred three".