155343345521 has 16 divisors (see below), whose sum is σ = 192587385984. Its totient is φ = 122011864704.

The previous prime is 155343345517. The next prime is 155343345551. The reversal of 155343345521 is 125543343551.

It is a cyclic number.

It is not a de Polignac number, because 155343345521 - 2² = 155343345517 is a prime.

It is a super-2 number, since 2×155343345521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155343345551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6217715 + ... + 6242648.

It is an arithmetic number, because the mean of its divisors is an integer number (12036711624).

Almost surely, 2^155343345521 is an apocalyptic number.

It is an amenable number.

155343345521 is a deficient number, since it is larger than the sum of its proper divisors (37244040463).

155343345521 is a wasteful number, since it uses less digits than its factorization.

155343345521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12460520.

The product of its digits is 540000, while the sum is 41.

The spelling of 155343345521 in words is "one hundred fifty-five billion, three hundred forty-three million, three hundred forty-five thousand, five hundred twenty-one".