155021221606 has 8 divisors (see below), whose sum is σ = 232538748120. Its totient is φ = 77508305568.

The previous prime is 155021221591. The next prime is 155021221633. The reversal of 155021221606 is 606122120551.

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

It is a super-2 number, since 2×155021221606² (a number of 23 digits) 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 3 ways as a sum of consecutive naturals, for example, 1067296 + ... + 1203811.

It is an arithmetic number, because the mean of its divisors is an integer number (29067343515).

Almost surely, 2^155021221606 is an apocalyptic number.

155021221606 is a deficient number, since it is larger than the sum of its proper divisors (77517526514).

155021221606 is a wasteful number, since it uses less digits than its factorization.

155021221606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2305238.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 155021221606 in words is "one hundred fifty-five billion, twenty-one million, two hundred twenty-one thousand, six hundred six".