15534421623 has 48 divisors (see below), whose sum is σ = 27159874560. Its totient is φ = 8687899296.

The previous prime is 15534421597. The next prime is 15534421633. The reversal of 15534421623 is 32612443551.

15534421623 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 4 + 4 + 21 + 623 = 666.

It is not a de Polignac number, because 15534421623 - 2²⁰ = 15533373047 is a prime.

It is a super-2 number, since 2×15534421623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15534421633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17208 + ... + 177101.

It is an arithmetic number, because the mean of its divisors is an integer number (565830720).

Almost surely, 2^15534421623 is an apocalyptic number.

15534421623 is a deficient number, since it is larger than the sum of its proper divisors (11625452937).

15534421623 is an equidigital number, since it uses as much as digits as its factorization.

15534421623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194378 (or 194366 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 15534421623 in words is "fifteen billion, five hundred thirty-four million, four hundred twenty-one thousand, six hundred twenty-three".