66051001555 has 16 divisors (see below), whose sum is σ = 98819161344. Its totient is φ = 41174650080.

The previous prime is 66051001487. The next prime is 66051001567. The reversal of 66051001555 is 55510015066.

It is not a de Polignac number, because 66051001555 - 2²¹ = 66048904403 is a prime.

It is a super-2 number, since 2×66051001555² (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 66051001555.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85780137 + ... + 85780906.

It is an arithmetic number, because the mean of its divisors is an integer number (6176197584).

Almost surely, 2^66051001555 is an apocalyptic number.

66051001555 is a deficient number, since it is larger than the sum of its proper divisors (32768159789).

66051001555 is a wasteful number, since it uses less digits than its factorization.

66051001555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171561066.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 66051001555 in words is "sixty-six billion, fifty-one million, one thousand, five hundred fifty-five".