1551661101109 has 8 divisors (see below), whose sum is σ = 1791608694848. Its totient is φ = 1316283937920.

The previous prime is 1551661101083. The next prime is 1551661101173. The reversal of 1551661101109 is 9011011661551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1551661101109 - 2¹¹ = 1551661099061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551661101509) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1142606907 + ... + 1142608264.

It is an arithmetic number, because the mean of its divisors is an integer number (223951086856).

Almost surely, 2^{1551661101109} is an apocalyptic number.

It is an amenable number.

1551661101109 is a deficient number, since it is larger than the sum of its proper divisors (239947593739).

1551661101109 is an equidigital number, since it uses as much as digits as its factorization.

1551661101109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285215275.

The product of its (nonzero) digits is 8100, while the sum is 37.

The spelling of 1551661101109 in words is "one trillion, five hundred fifty-one billion, six hundred sixty-one million, one hundred one thousand, one hundred nine".