66725103621 has 16 divisors (see below), whose sum is σ = 102162839040. Its totient is φ = 38311063920.

The previous prime is 66725103619. The next prime is 66725103631. The reversal of 66725103621 is 12630152766.

It is not a de Polignac number, because 66725103621 - 2¹ = 66725103619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66725103621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66725103631) 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, 53209185 + ... + 53210438.

It is an arithmetic number, because the mean of its divisors is an integer number (6385177440).

Almost surely, 2^66725103621 is an apocalyptic number.

It is an amenable number.

66725103621 is a deficient number, since it is larger than the sum of its proper divisors (35437735419).

66725103621 is a wasteful number, since it uses less digits than its factorization.

66725103621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106419656.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 66725103621 in words is "sixty-six billion, seven hundred twenty-five million, one hundred three thousand, six hundred twenty-one".