155326550021 has 4 divisors (see below), whose sum is σ = 155486516544. Its totient is φ = 155166583500.

The previous prime is 155326550009. The next prime is 155326550047. The reversal of 155326550021 is 120055623551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155326550021 - 2³⁰ = 154252808197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155326550051) 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 3 ways as a sum of consecutive naturals, for example, 79981805 + ... + 79983746.

It is an arithmetic number, because the mean of its divisors is an integer number (38871629136).

Almost surely, 2^155326550021 is an apocalyptic number.

It is an amenable number.

155326550021 is a deficient number, since it is larger than the sum of its proper divisors (159966523).

155326550021 is an equidigital number, since it uses as much as digits as its factorization.

155326550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159966522.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 155326550021 in words is "one hundred fifty-five billion, three hundred twenty-six million, five hundred fifty thousand, twenty-one".