66611615551151 has 24 divisors (see below), whose sum is σ = 74042183309472. Its totient is φ = 59875746392000.

The previous prime is 66611615551147. The next prime is 66611615551211. The reversal of 66611615551151 is 15115551611666.

It is not a de Polignac number, because 66611615551151 - 2² = 66611615551147 is a prime.

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 66611615551151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66611615551951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5412245 + ... + 12748161.

It is an arithmetic number, because the mean of its divisors is an integer number (3085090971228).

Almost surely, 2^{66611615551151} is an apocalyptic number.

66611615551151 is a deficient number, since it is larger than the sum of its proper divisors (7430567758321).

66611615551151 is a wasteful number, since it uses less digits than its factorization.

66611615551151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336783 (or 7336772 counting only the distinct ones).

The product of its digits is 810000, while the sum is 50.

The spelling of 66611615551151 in words is "sixty-six trillion, six hundred eleven billion, six hundred fifteen million, five hundred fifty-one thousand, one hundred fifty-one".