1551166556 has 12 divisors (see below), whose sum is σ = 2717692992. Its totient is φ = 774682848.

The previous prime is 1551166553. The next prime is 1551166567. The reversal of 1551166556 is 6556611551.

It is a super-2 number, since 2×1551166556² = 4812235368905802272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551166553) 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 3 ways as a sum of consecutive naturals, for example, 221225 + ... + 228128.

It is an arithmetic number, because the mean of its divisors is an integer number (226474416).

Almost surely, 2^1551166556 is an apocalyptic number.

It is an amenable number.

1551166556 is a deficient number, since it is larger than the sum of its proper divisors (1166526436).

1551166556 is a wasteful number, since it uses less digits than its factorization.

1551166556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450220 (or 450218 counting only the distinct ones).

The product of its digits is 135000, while the sum is 41.

The square root of 1551166556 is about 39384.8518595665. The cubic root of 1551166556 is about 1157.5847875482.

The spelling of 1551166556 in words is "one billion, five hundred fifty-one million, one hundred sixty-six thousand, five hundred fifty-six".