66125653555 has 16 divisors (see below), whose sum is σ = 85471162560. Its totient is φ = 48821839488.

The previous prime is 66125653549. The next prime is 66125653589. The reversal of 66125653555 is 55535652166.

It is a cyclic number.

It is not a de Polignac number, because 66125653555 - 2¹³ = 66125645363 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66125653499 and 66125653508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251266 + ... + 442024.

It is an arithmetic number, because the mean of its divisors is an integer number (5341947660).

Almost surely, 2^66125653555 is an apocalyptic number.

66125653555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66125653555 is a deficient number, since it is larger than the sum of its proper divisors (19345509005).

66125653555 is a wasteful number, since it uses less digits than its factorization.

66125653555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196110.

The product of its digits is 4050000, while the sum is 49.

The spelling of 66125653555 in words is "sixty-six billion, one hundred twenty-five million, six hundred fifty-three thousand, five hundred fifty-five".