1161618350656 has 63 divisors (see below), whose sum is σ = 2320155076089. Its totient is φ = 577036931328.

The previous prime is 1161618350611. The next prime is 1161618350657. The reversal of 1161618350656 is 6560538161611.

The square root of 1161618350656 is 1077784.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1154765160000 + 6853190656 = 1074600^2 + 82784^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161618350657) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1715831790 + ... + 1715832466.

Almost surely, 2^{1161618350656} is an apocalyptic number.

1161618350656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1161618350656 is the 1077784-th square number.

It is an amenable number.

1161618350656 is a deficient number, since it is larger than the sum of its proper divisors (1158536725433).

1161618350656 is an frugal number, since it uses more digits than its factorization.

1161618350656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1764 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

Multiplying 1161618350656 by its sum of digits (49), we get a square (56919299182144 = 7544488²).

The spelling of 1161618350656 in words is "one trillion, one hundred sixty-one billion, six hundred eighteen million, three hundred fifty thousand, six hundred fifty-six".