15561425670454 has 4 divisors (see below), whose sum is σ = 23342138505684. Its totient is φ = 7780712835226.

The previous prime is 15561425670451. The next prime is 15561425670491. The reversal of 15561425670454 is 45407652416551.

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

It is a super-2 number, since 2×15561425670454² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15561425670395 and 15561425670404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561425670451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3890356417612 + ... + 3890356417615.

It is an arithmetic number, because the mean of its divisors is an integer number (5835534626421).

Almost surely, 2^{15561425670454} is an apocalyptic number.

15561425670454 is a deficient number, since it is larger than the sum of its proper divisors (7780712835230).

15561425670454 is an equidigital number, since it uses as much as digits as its factorization.

15561425670454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780712835229.

The product of its (nonzero) digits is 20160000, while the sum is 55.

The spelling of 15561425670454 in words is "fifteen trillion, five hundred sixty-one billion, four hundred twenty-five million, six hundred seventy thousand, four hundred fifty-four".