5551554561 has 32 divisors (see below), whose sum is σ = 8966412288. Its totient is φ = 2982616320.

The previous prime is 5551554557. The next prime is 5551554599. The reversal of 5551554561 is 1654551555.

It is not a de Polignac number, because 5551554561 - 2² = 5551554557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5551554661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360526 + ... + 375608.

It is an arithmetic number, because the mean of its divisors is an integer number (280200384).

It is a Proth number, since it is equal to 42355 ⋅ 2¹⁷ + 1 and 42355 < 2¹⁷.

Almost surely, 2^5551554561 is an apocalyptic number.

5551554561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

5551554561 is a deficient number, since it is larger than the sum of its proper divisors (3414857727).

5551554561 is a wasteful number, since it uses less digits than its factorization.

5551554561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16141.

The product of its digits is 375000, while the sum is 42.

The square root of 5551554561 is about 74508.7549285317. The cubic root of 5551554561 is about 1770.6723440826.

The spelling of 5551554561 in words is "five billion, five hundred fifty-one million, five hundred fifty-four thousand, five hundred sixty-one".