220161537 has 8 divisors (see below), whose sum is σ = 326165280. Its totient is φ = 146774340.

The previous prime is 220161481. The next prime is 220161547. The reversal of 220161537 is 735161022.

It is a happy number.

It is not a de Polignac number, because 220161537 - 2⁸ = 220161281 is a prime.

It is a super-2 number, since 2×220161537² = 96942204748404738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8154131 = 220161537 / (2 + 2 + 0 + 1 + 6 + 1 + 5 + 3 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 220161537.

It is not an unprimeable number, because it can be changed into a prime (220161547) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4077039 + ... + 4077092.

It is an arithmetic number, because the mean of its divisors is an integer number (40770660).

Almost surely, 2^220161537 is an apocalyptic number.

220161537 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

220161537 is a deficient number, since it is larger than the sum of its proper divisors (106003743).

220161537 is an equidigital number, since it uses as much as digits as its factorization.

220161537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8154140 (or 8154134 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 220161537 is about 14837.8413861316. The cubic root of 220161537 is about 603.8287903037.

The spelling of 220161537 in words is "two hundred twenty million, one hundred sixty-one thousand, five hundred thirty-seven".