15001445561 has 4 divisors (see below), whose sum is σ = 15350316432. Its totient is φ = 14652574692.

The previous prime is 15001445527. The next prime is 15001445567. The reversal of 15001445561 is 16554410051.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15001445561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (15001445567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174435371 + ... + 174435456.

It is an arithmetic number, because the mean of its divisors is an integer number (3837579108).

Almost surely, 2^15001445561 is an apocalyptic number.

It is an amenable number.

15001445561 is a deficient number, since it is larger than the sum of its proper divisors (348870871).

15001445561 is an equidigital number, since it uses as much as digits as its factorization.

15001445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348870870.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 15001445561 in words is "fifteen billion, one million, four hundred forty-five thousand, five hundred sixty-one".