155666280 has 256 divisors, whose sum is σ = 617103360. Its totient is φ = 30412800.

The previous prime is 155666267. The next prime is 155666309. The reversal of 155666280 is 82666551.

155666280 = T₂₁₆ + T₂₁₇ + ... + T₉₈₀.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156585 + ... + 157575.

It is an arithmetic number, because the mean of its divisors is an integer number (2410560).

Almost surely, 2^155666280 is an apocalyptic number.

155666280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155666280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308551680).

155666280 is an abundant number, since it is smaller than the sum of its proper divisors (461437080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155666280 is a wasteful number, since it uses less digits than its factorization.

155666280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 155666280 is about 12476.6293525134. The cubic root of 155666280 is about 537.9371226895.

It can be divided in two parts, 155 and 666280, that added together give a triangular number (666435 = T₁₁₅₄).

The spelling of 155666280 in words is "one hundred fifty-five million, six hundred sixty-six thousand, two hundred eighty".