166249680 has 40 divisors (see below), whose sum is σ = 515374752. Its totient is φ = 44333184.

The previous prime is 166249673. The next prime is 166249693. The reversal of 166249680 is 86942661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×166249680² = 55277912200204800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346114 + ... + 346593.

Almost surely, 2^166249680 is an apocalyptic number.

166249680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166249680 is an abundant number, since it is smaller than the sum of its proper divisors (349125072).

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

166249680 is a wasteful number, since it uses less digits than its factorization.

166249680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692723 (or 692717 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 166249680 is about 12893.7845491539. The cubic root of 166249680 is about 549.8618716491.

It can be divided in two parts, 1662496 and 80, that added together give a triangular number (1662576 = T₁₈₂₃).

The spelling of 166249680 in words is "one hundred sixty-six million, two hundred forty-nine thousand, six hundred eighty".