1550511666667 has 4 divisors (see below), whose sum is σ = 1632117543880. Its totient is φ = 1468905789456.

The previous prime is 1550511666637. The next prime is 1550511666709. The reversal of 1550511666667 is 7666661150551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1550511666667 - 2³⁹ = 1000755852779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1550511666637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40802938578 + ... + 40802938615.

It is an arithmetic number, because the mean of its divisors is an integer number (408029385970).

Almost surely, 2^{1550511666667} is an apocalyptic number.

1550511666667 is a deficient number, since it is larger than the sum of its proper divisors (81605877213).

1550511666667 is an equidigital number, since it uses as much as digits as its factorization.

1550511666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81605877212.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 1550511666667 in words is "one trillion, five hundred fifty billion, five hundred eleven million, six hundred sixty-six thousand, six hundred sixty-seven".