158217660 has 36 divisors (see below), whose sum is σ = 479927448. Its totient is φ = 42191328.

The previous prime is 158217643. The next prime is 158217679. The reversal of 158217660 is 66712851.

158217660 is a `hidden beast` number, since 1 + 582 + 1 + 76 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439314 + ... + 439673.

It is an arithmetic number, because the mean of its divisors is an integer number (13331318).

Almost surely, 2^158217660 is an apocalyptic number.

158217660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158217660 is an abundant number, since it is smaller than the sum of its proper divisors (321709788).

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

158217660 is a wasteful number, since it uses less digits than its factorization.

158217660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879002 (or 878997 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 158217660 is about 12578.4601601309. The cubic root of 158217660 is about 540.8601517931.

The spelling of 158217660 in words is "one hundred fifty-eight million, two hundred seventeen thousand, six hundred sixty".