1561066054 has 4 divisors (see below), whose sum is σ = 2341599084. Its totient is φ = 780533026.

The previous prime is 1561065971. The next prime is 1561066069. The reversal of 1561066054 is 4506601651.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4506601651 = 31849 ⋅141499.

It is a super-2 number, since 2×1561066054² = 4873854449902261832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390266512 + ... + 390266515.

It is an arithmetic number, because the mean of its divisors is an integer number (585399771).

Almost surely, 2^1561066054 is an apocalyptic number.

1561066054 is a deficient number, since it is larger than the sum of its proper divisors (780533030).

1561066054 is an equidigital number, since it uses as much as digits as its factorization.

1561066054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780533029.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1561066054 is about 39510.3284471289. The cubic root of 1561066054 is about 1160.0421244116.

The spelling of 1561066054 in words is "one billion, five hundred sixty-one million, sixty-six thousand, fifty-four".