1561617796 has 6 divisors (see below), whose sum is σ = 2732831150. Its totient is φ = 780808896.

The previous prime is 1561617793. The next prime is 1561617803. The reversal of 1561617796 is 6977161651.

It can be written as a sum of positive squares in only one way, i.e., 813048196 + 748569600 = 28514^2 + 27360^2 .

It is not an unprimeable number, because it can be changed into a prime (1561617791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195202221 + ... + 195202228.

Almost surely, 2^1561617796 is an apocalyptic number.

It is an amenable number.

1561617796 is a deficient number, since it is larger than the sum of its proper divisors (1171213354).

1561617796 is a wasteful number, since it uses less digits than its factorization.

1561617796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390404453 (or 390404451 counting only the distinct ones).

The product of its digits is 476280, while the sum is 49.

The square root of 1561617796 is about 39517.3100805204. The cubic root of 1561617796 is about 1160.1787764492.

The spelling of 1561617796 in words is "one billion, five hundred sixty-one million, six hundred seventeen thousand, seven hundred ninety-six".