1661390814200 has 96 divisors (see below), whose sum is σ = 4378807498800. Its totient is φ = 581150453760.

The previous prime is 1661390814199. The next prime is 1661390814217. The reversal of 1661390814200 is 24180931661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16766297 + ... + 16865096.

Almost surely, 2^{1661390814200} is an apocalyptic number.

1661390814200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661390814200 is an abundant number, since it is smaller than the sum of its proper divisors (2717416684600).

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

1661390814200 is a wasteful number, since it uses less digits than its factorization.

1661390814200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33631441 (or 33631432 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The spelling of 1661390814200 in words is "one trillion, six hundred sixty-one billion, three hundred ninety million, eight hundred fourteen thousand, two hundred".