159549781970 has 8 divisors (see below), whose sum is σ = 287189607564. Its totient is φ = 63819912784.

The previous prime is 159549781939. The next prime is 159549781973. The reversal of 159549781970 is 79187945951.

It can be written as a sum of positive squares in 2 ways, for example, as 137759003281 + 21790778689 = 371159^2 + 147617^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×159549781970² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 159549781897 and 159549781906.

It is not an unprimeable number, because it can be changed into a prime (159549781973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7977489089 + ... + 7977489108.

Almost surely, 2^159549781970 is an apocalyptic number.

159549781970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

159549781970 is a deficient number, since it is larger than the sum of its proper divisors (127639825594).

159549781970 is a wasteful number, since it uses less digits than its factorization.

159549781970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954978204.

The product of its (nonzero) digits is 28576800, while the sum is 65.

The spelling of 159549781970 in words is "one hundred fifty-nine billion, five hundred forty-nine million, seven hundred eighty-one thousand, nine hundred seventy".