15642256447457 has 8 divisors (see below), whose sum is σ = 15756645206376. Its totient is φ = 15527870756992.

The previous prime is 15642256447427. The next prime is 15642256447481. The reversal of 15642256447457 is 75474465224651.

It can be written as a sum of positive squares in 4 ways, for example, as 4341155599936 + 11301100847521 = 2083544^2 + 3361711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15642256447457 - 2⁸ = 15642256447201 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 15642256447457.

It is not an unprimeable number, because it can be changed into a prime (15642256447427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10018043 + ... + 11473695.

It is an arithmetic number, because the mean of its divisors is an integer number (1969580650797).

Almost surely, 2^{15642256447457} is an apocalyptic number.

It is an amenable number.

15642256447457 is a deficient number, since it is larger than the sum of its proper divisors (114388758919).

15642256447457 is a wasteful number, since it uses less digits than its factorization.

15642256447457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534227.

The product of its digits is 225792000, while the sum is 62.

The spelling of 15642256447457 in words is "fifteen trillion, six hundred forty-two billion, two hundred fifty-six million, four hundred forty-seven thousand, four hundred fifty-seven".