15551206242459 has 4 divisors (see below), whose sum is σ = 20734941656616. Its totient is φ = 10367470828304.

The previous prime is 15551206242443. The next prime is 15551206242479. The reversal of 15551206242459 is 95424260215551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15551206242459 - 2⁴ = 15551206242443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15551206242479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2591867707074 + ... + 2591867707079.

It is an arithmetic number, because the mean of its divisors is an integer number (5183735414154).

Almost surely, 2^{15551206242459} is an apocalyptic number.

15551206242459 is a deficient number, since it is larger than the sum of its proper divisors (5183735414157).

15551206242459 is an equidigital number, since it uses as much as digits as its factorization.

15551206242459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5183735414156.

The product of its (nonzero) digits is 4320000, while the sum is 51.

The spelling of 15551206242459 in words is "fifteen trillion, five hundred fifty-one billion, two hundred six million, two hundred forty-two thousand, four hundred fifty-nine".