1665060656551 has 6 divisors (see below), whose sum is σ = 1768766856920. Its totient is φ = 1567115911776.

The previous prime is 1665060656489. The next prime is 1665060656587. The reversal of 1665060656551 is 1556560605661.

It is not a de Polignac number, because 1665060656551 - 2³¹ = 1662913172903 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 (1665060656591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2880727491 + ... + 2880728068.

Almost surely, 2^{1665060656551} is an apocalyptic number.

1665060656551 is a deficient number, since it is larger than the sum of its proper divisors (103706200369).

1665060656551 is an equidigital number, since it uses as much as digits as its factorization.

1665060656551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761455593 (or 5761455576 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 52.

The spelling of 1665060656551 in words is "one trillion, six hundred sixty-five billion, sixty million, six hundred fifty-six thousand, five hundred fifty-one".