1661867799468 has 24 divisors (see below), whose sum is σ = 4046286816768. Its totient is φ = 529870892496.

The previous prime is 1661867799463. The next prime is 1661867799503. The reversal of 1661867799468 is 8649977681661.

It is a super-2 number, since 2×1661867799468² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1661867799393 and 1661867799402.

It is not an unprimeable number, because it can be changed into a prime (1661867799463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3010629796 + ... + 3010630347.

It is an arithmetic number, because the mean of its divisors is an integer number (168595284032).

Almost surely, 2^{1661867799468} is an apocalyptic number.

It is an amenable number.

1661867799468 is an abundant number, since it is smaller than the sum of its proper divisors (2384419017300).

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

1661867799468 is a wasteful number, since it uses less digits than its factorization.

1661867799468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6021260173 (or 6021260171 counting only the distinct ones).

The product of its digits is 1316818944, while the sum is 78.

The spelling of 1661867799468 in words is "one trillion, six hundred sixty-one billion, eight hundred sixty-seven million, seven hundred ninety-nine thousand, four hundred sixty-eight".