155321005511 has 24 divisors (see below), whose sum is σ = 183220302960. Its totient is φ = 131261461632.

The previous prime is 155321005453. The next prime is 155321005517. The reversal of 155321005511 is 115500123551.

It is not a de Polignac number, because 155321005511 - 2⁶ = 155321005447 is a prime.

It is a super-2 number, since 2×155321005511² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155321005517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13003580 + ... + 13015518.

It is an arithmetic number, because the mean of its divisors is an integer number (7634179290).

Almost surely, 2^155321005511 is an apocalyptic number.

155321005511 is a deficient number, since it is larger than the sum of its proper divisors (27899297449).

155321005511 is a wasteful number, since it uses less digits than its factorization.

155321005511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15663 (or 15656 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 29.

The spelling of 155321005511 in words is "one hundred fifty-five billion, three hundred twenty-one million, five thousand, five hundred eleven".