1551661055 has 32 divisors (see below), whose sum is σ = 2177777664. Its totient is φ = 1039199616.

The previous prime is 1551661039. The next prime is 1551661091. The reversal of 1551661055 is 5501661551.

It is not a de Polignac number, because 1551661055 - 2⁴ = 1551661039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1419089 + ... + 1420181.

It is an arithmetic number, because the mean of its divisors is an integer number (68055552).

Almost surely, 2^1551661055 is an apocalyptic number.

1551661055 is a deficient number, since it is larger than the sum of its proper divisors (626116609).

1551661055 is a wasteful number, since it uses less digits than its factorization.

1551661055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 1551661055 is about 39391.1291409627. The cubic root of 1551661055 is about 1157.7077839473.

The spelling of 1551661055 in words is "one billion, five hundred fifty-one million, six hundred sixty-one thousand, fifty-five".