15515115640 has 32 divisors (see below), whose sum is σ = 34913015280. Its totient is φ = 6205334272.

The previous prime is 15515115617. The next prime is 15515115641. The reversal of 15515115640 is 4651151551.

15515115640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15515115596 and 15515115605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15515115641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459579 + ... + 492181.

Almost surely, 2^15515115640 is an apocalyptic number.

15515115640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15515115640 is an abundant number, since it is smaller than the sum of its proper divisors (19397899640).

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

15515115640 is a wasteful number, since it uses less digits than its factorization.

15515115640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44511 (or 44507 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 34.

The spelling of 15515115640 in words is "fifteen billion, five hundred fifteen million, one hundred fifteen thousand, six hundred forty".