15540001023 has 8 divisors (see below), whose sum is σ = 20737461888. Its totient is φ = 10351270424.

The previous prime is 15540000989. The next prime is 15540001093. The reversal of 15540001023 is 32010004551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15540001023 - 2¹⁴ = 15539984639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540001093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2178411 + ... + 2185532.

It is an arithmetic number, because the mean of its divisors is an integer number (2592182736).

Almost surely, 2^15540001023 is an apocalyptic number.

15540001023 is a deficient number, since it is larger than the sum of its proper divisors (5197460865).

15540001023 is a wasteful number, since it uses less digits than its factorization.

15540001023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365133.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 15540001023 its reverse (32010004551), we get a palindrome (47550005574).

The spelling of 15540001023 in words is "fifteen billion, five hundred forty million, one thousand, twenty-three".