156222561 has 8 divisors (see below), whose sum is σ = 227232864. Its totient is φ = 94680320.

The previous prime is 156222551. The next prime is 156222581. The reversal of 156222561 is 165222651.

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

It is a cyclic number.

It is not a de Polignac number, because 156222561 - 2⁷ = 156222433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156222551) 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, 2366976 + ... + 2367041.

It is an arithmetic number, because the mean of its divisors is an integer number (28404108).

Almost surely, 2^156222561 is an apocalyptic number.

156222561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

156222561 is a deficient number, since it is larger than the sum of its proper divisors (71010303).

156222561 is a wasteful number, since it uses less digits than its factorization.

156222561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4734031.

The product of its digits is 7200, while the sum is 30.

The square root of 156222561 is about 12498.9023918103. The cubic root of 156222561 is about 538.5771423777.

The spelling of 156222561 in words is "one hundred fifty-six million, two hundred twenty-two thousand, five hundred sixty-one".