155446612221 has 8 divisors (see below), whose sum is σ = 207263970880. Its totient is φ = 103630164192.

The previous prime is 155446612177. The next prime is 155446612247. The reversal of 155446612221 is 122216644551.

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

It is not a de Polignac number, because 155446612221 - 2⁷ = 155446612093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155446612221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155446614221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557160 + ... + 788238.

It is an arithmetic number, because the mean of its divisors is an integer number (25907996360).

Almost surely, 2^155446612221 is an apocalyptic number.

It is an amenable number.

155446612221 is a deficient number, since it is larger than the sum of its proper divisors (51817358659).

155446612221 is a wasteful number, since it uses less digits than its factorization.

155446612221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455315.

The product of its digits is 115200, while the sum is 39.

The spelling of 155446612221 in words is "one hundred fifty-five billion, four hundred forty-six million, six hundred twelve thousand, two hundred twenty-one".