15515050204240 has 160 divisors (see below), whose sum is σ = 37429964328960. Its totient is φ = 5976430387200.

The previous prime is 15515050204237. The next prime is 15515050204253. The reversal of 15515050204240 is 4240205051551.

It is a junction number, because it is equal to n+sod(n) for n = 15515050204196 and 15515050204205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1610944225 + ... + 1610953855.

It is an arithmetic number, because the mean of its divisors is an integer number (233937277056).

Almost surely, 2^{15515050204240} is an apocalyptic number.

15515050204240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15515050204240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18714982164480).

15515050204240 is an abundant number, since it is smaller than the sum of its proper divisors (21914914124720).

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

15515050204240 is a wasteful number, since it uses less digits than its factorization.

15515050204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15981 (or 15975 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

Adding to 15515050204240 its reverse (4240205051551), we get a palindrome (19755255255791).

The spelling of 15515050204240 in words is "fifteen trillion, five hundred fifteen billion, fifty million, two hundred four thousand, two hundred forty".