1661034498858 has 96 divisors (see below), whose sum is σ = 4303229500800. Its totient is φ = 473542469568.

The previous prime is 1661034498857. The next prime is 1661034498863. The reversal of 1661034498858 is 8588944301661.

1661034498858 is a `hidden beast` number, since 1 + 6 + 6 + 103 + 449 + 8 + 85 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 1661034498795 and 1661034498804.

It is not an unprimeable number, because it can be changed into a prime (1661034498857) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 522403 + ... + 1896041.

It is an arithmetic number, because the mean of its divisors is an integer number (44825307300).

Almost surely, 2^{1661034498858} is an apocalyptic number.

1661034498858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661034498858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2151614750400).

1661034498858 is an abundant number, since it is smaller than the sum of its proper divisors (2642195001942).

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

1661034498858 is a wasteful number, since it uses less digits than its factorization.

1661034498858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374121 (or 1374108 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 63.

The spelling of 1661034498858 in words is "one trillion, six hundred sixty-one billion, thirty-four million, four hundred ninety-eight thousand, eight hundred fifty-eight".