123530451555 has 64 divisors (see below), whose sum is σ = 228267832320. Its totient is φ = 55876594176.

The previous prime is 123530451523. The next prime is 123530451559. The reversal of 123530451555 is 555154035321.

It is not a de Polignac number, because 123530451555 - 2⁵ = 123530451523 is a prime.

It is a super-2 number, since 2×123530451555² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123530451559) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8840004 + ... + 8853966.

It is an arithmetic number, because the mean of its divisors is an integer number (3566684880).

Almost surely, 2^123530451555 is an apocalyptic number.

123530451555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123530451555 is a deficient number, since it is larger than the sum of its proper divisors (104737380765).

123530451555 is a wasteful number, since it uses less digits than its factorization.

123530451555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14860.

The product of its (nonzero) digits is 225000, while the sum is 39.

Adding to 123530451555 its reverse (555154035321), we get a palindrome (678684486876).

The spelling of 123530451555 in words is "one hundred twenty-three billion, five hundred thirty million, four hundred fifty-one thousand, five hundred fifty-five".