1551161555 has 16 divisors (see below), whose sum is σ = 1897113504. Its totient is φ = 1217272320.

The previous prime is 1551161551. The next prime is 1551161567. The reversal of 1551161555 is 5551611551.

It is not a de Polignac number, because 1551161555 - 2² = 1551161551 is a prime.

It is a super-2 number, since 2×1551161555² = 4812204339420036050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1551161551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71129 + ... + 90341.

It is an arithmetic number, because the mean of its divisors is an integer number (118569594).

Almost surely, 2^1551161555 is an apocalyptic number.

1551161555 is a deficient number, since it is larger than the sum of its proper divisors (345951949).

1551161555 is a wasteful number, since it uses less digits than its factorization.

1551161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19526.

The product of its digits is 18750, while the sum is 35.

The square root of 1551161555 is about 39384.7883706387. The cubic root of 1551161555 is about 1157.5835435193.

The spelling of 1551161555 in words is "one billion, five hundred fifty-one million, one hundred sixty-one thousand, five hundred fifty-five".