1181761858890 has 48 divisors (see below), whose sum is σ = 3095008462728. Its totient is φ = 312836226048.

The previous prime is 1181761858853. The next prime is 1181761858891. The reversal of 1181761858890 is 988581671811.

1181761858890 is a `hidden beast` number, since 1 + 1 + 8 + 1 + 7 + 618 + 5 + 8 + 8 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1024129832049 + 157632026841 = 1011993^2 + 397029^2 .

It is a super-2 number, since 2×1181761858890² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1181761858891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47909887 + ... + 47934546.

Almost surely, 2^{1181761858890} is an apocalyptic number.

1181761858890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1181761858890 is an abundant number, since it is smaller than the sum of its proper divisors (1913246603838).

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

1181761858890 is a wasteful number, since it uses less digits than its factorization.

1181761858890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95844583 (or 95844580 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 63.

It can be divided in two parts, 118176 and 1858890, that added together give a triangular number (1977066 = T₁₉₈₈).

The spelling of 1181761858890 in words is "one trillion, one hundred eighty-one billion, seven hundred sixty-one million, eight hundred fifty-eight thousand, eight hundred ninety".