1661852994400 has 36 divisors (see below), whose sum is σ = 4056998624532. Its totient is φ = 664741197440.

The previous prime is 1661852994397. The next prime is 1661852994421. The reversal of 1661852994400 is 44992581661.

It is a super-4 number, since 4×1661852994400⁴ (a number of 50 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1038657322 + ... + 1038658921.

It is an arithmetic number, because the mean of its divisors is an integer number (112694406237).

Almost surely, 2^{1661852994400} is an apocalyptic number.

1661852994400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661852994400 is an abundant number, since it is smaller than the sum of its proper divisors (2395145630132).

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

1661852994400 is a wasteful number, since it uses less digits than its factorization.

1661852994400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077316263 (or 2077316250 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 1661852994400 in words is "one trillion, six hundred sixty-one billion, eight hundred fifty-two million, nine hundred ninety-four thousand, four hundred".