10115501561 has 16 divisors (see below), whose sum is σ = 11812780800. Its totient is φ = 8564245200.

The previous prime is 10115501527. The next prime is 10115501609. The reversal of 10115501561 is 16510551101.

It is a cyclic number.

It is not a de Polignac number, because 10115501561 - 2³⁰ = 9041759737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10115501561.

It is not an unprimeable number, because it can be changed into a prime (10115501161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397835 + ... + 422496.

It is an arithmetic number, because the mean of its divisors is an integer number (738298800).

Almost surely, 2^10115501561 is an apocalyptic number.

10115501561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10115501561 is a deficient number, since it is larger than the sum of its proper divisors (1697279239).

10115501561 is a wasteful number, since it uses less digits than its factorization.

10115501561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820420.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 10115501561 in words is "ten billion, one hundred fifteen million, five hundred one thousand, five hundred sixty-one".