1561066598 has 24 divisors (see below), whose sum is σ = 2933435232. Its totient is φ = 617564304.

The previous prime is 1561066583. The next prime is 1561066621. The reversal of 1561066598 is 8956601651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 611390 + ... + 613937.

It is an arithmetic number, because the mean of its divisors is an integer number (122226468).

Almost surely, 2^1561066598 is an apocalyptic number.

1561066598 is a deficient number, since it is larger than the sum of its proper divisors (1372368634).

1561066598 is a wasteful number, since it uses less digits than its factorization.

1561066598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225356 (or 1225349 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 1561066598 is about 39510.3353314041. The cubic root of 1561066598 is about 1160.0422591620.

The spelling of 1561066598 in words is "one billion, five hundred sixty-one million, sixty-six thousand, five hundred ninety-eight".