1181865672650 has 36 divisors (see below), whose sum is σ = 2367423374946. Its totient is φ = 436370937600.

The previous prime is 1181865672593. The next prime is 1181865672671. The reversal of 1181865672650 is 562765681811.

It can be written as a sum of positive squares in 9 ways, for example, as 46858827961 + 1135006844689 = 216469^2 + 1065367^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 27695330 + ... + 27737970.

Almost surely, 2^{1181865672650} is an apocalyptic number.

1181865672650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1181865672650 is an abundant number, since it is smaller than the sum of its proper divisors (1185557702296).

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

1181865672650 is an frugal number, since it uses more digits than its factorization.

1181865672650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85307 (or 42661 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1181865672650 in words is "one trillion, one hundred eighty-one billion, eight hundred sixty-five million, six hundred seventy-two thousand, six hundred fifty".