15540535023 has 32 divisors (see below), whose sum is σ = 23663650752. Its totient is φ = 8986982400.

The previous prime is 15540534953. The next prime is 15540535033. The reversal of 15540535023 is 32053504551.

It is a happy number.

It is not a de Polignac number, because 15540535023 - 2¹⁶ = 15540469487 is a prime.

It is a super-2 number, since 2×15540535023² (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 (15540535033) 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 31 ways as a sum of consecutive naturals, for example, 420513 + ... + 455973.

It is an arithmetic number, because the mean of its divisors is an integer number (739489086).

Almost surely, 2^15540535023 is an apocalyptic number.

15540535023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15540535023 is a deficient number, since it is larger than the sum of its proper divisors (8123115729).

15540535023 is a wasteful number, since it uses less digits than its factorization.

15540535023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36155.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 15540535023 in words is "fifteen billion, five hundred forty million, five hundred thirty-five thousand, twenty-three".