1618991580816 has 45 divisors (see below), whose sum is σ = 4530970558569. Its totient is φ = 539658770688.

The previous prime is 1618991580803. The next prime is 1618991580859. The reversal of 1618991580816 is 6180851998161.

The square root of 1618991580816 is 1272396.

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

1618991580816 is a `hidden beast` number, since 1 + 618 + 9 + 9 + 1 + 5 + 8 + 0 + 8 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 150280275600 + 1468711305216 = 387660^2 + 1211904^2 .

It is a super-2 number, since 2×1618991580816² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15215736 + ... + 15321768.

Almost surely, 2^{1618991580816} is an apocalyptic number.

1618991580816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1618991580816 is the 1272396-th square number.

It is an amenable number.

1618991580816 is an abundant number, since it is smaller than the sum of its proper divisors (2911978977753).

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

1618991580816 is an frugal number, since it uses more digits than its factorization.

1618991580816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212080 (or 106038 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 63.

The spelling of 1618991580816 in words is "one trillion, six hundred eighteen billion, nine hundred ninety-one million, five hundred eighty thousand, eight hundred sixteen".