15540345345 has 24 divisors (see below), whose sum is σ = 28924072704. Its totient is φ = 7104157536.

The previous prime is 15540345341. The next prime is 15540345349. The reversal of 15540345345 is 54354304551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15540345341) and next prime (15540345349).

It is not a de Polignac number, because 15540345345 - 2² = 15540345341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15540345341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10570929 + ... + 10572398.

It is an arithmetic number, because the mean of its divisors is an integer number (1205169696).

Almost surely, 2^15540345345 is an apocalyptic number.

15540345345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15540345345 is a deficient number, since it is larger than the sum of its proper divisors (13383727359).

15540345345 is a wasteful number, since it uses less digits than its factorization.

15540345345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21143349 (or 21143342 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 15540345345 its reverse (54354304551), we get a palindrome (69894649896).

The spelling of 15540345345 in words is "fifteen billion, five hundred forty million, three hundred forty-five thousand, three hundred forty-five".