1561061270826 has 96 divisors (see below), whose sum is σ = 3774651950160. Its totient is φ = 463934994432.

The previous prime is 1561061270767. The next prime is 1561061270827. The reversal of 1561061270826 is 6280721601651.

1561061270826 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 0 + 612 + 7 + 0 + 8 + 26 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1287432891801 + 273628379025 = 1134651^2 + 523095^2 .

It is a super-2 number, since 2×1561061270826² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561061270827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1189245 + ... + 2129888.

Almost surely, 2^{1561061270826} is an apocalyptic number.

1561061270826 is an abundant number, since it is smaller than the sum of its proper divisors (2213590679334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561061270826 is a wasteful number, since it uses less digits than its factorization.

1561061270826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319240 (or 3319237 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 1561061270826 in words is "one trillion, five hundred sixty-one billion, sixty-one million, two hundred seventy thousand, eight hundred twenty-six".