15515542540 has 24 divisors (see below), whose sum is σ = 32585595840. Its totient is φ = 6205653888.

The previous prime is 15515542529. The next prime is 15515542589. The reversal of 15515542540 is 4524551551.

It is a self number, because there is not a number n which added to its sum of digits gives 15515542540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245224 + ... + 301936.

It is an arithmetic number, because the mean of its divisors is an integer number (1357733160).

Almost surely, 2^15515542540 is an apocalyptic number.

15515542540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15515542540 is an abundant number, since it is smaller than the sum of its proper divisors (17070053300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15515542540 is a wasteful number, since it uses less digits than its factorization.

15515542540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70401 (or 70399 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 15515542540 in words is "fifteen billion, five hundred fifteen million, five hundred forty-two thousand, five hundred forty".