1661342682500 has 30 divisors (see below), whose sum is σ = 3633024183558. Its totient is φ = 664537072000.

The previous prime is 1661342682427. The next prime is 1661342682557. The reversal of 1661342682500 is 52862431661.

It can be written as a sum of positive squares in 5 ways, for example, as 404150089984 + 1257192592516 = 635728^2 + 1121246^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 332266037 + ... + 332271036.

Almost surely, 2^{1661342682500} is an apocalyptic number.

1661342682500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661342682500 is an abundant number, since it is smaller than the sum of its proper divisors (1971681501058).

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

1661342682500 is an equidigital number, since it uses as much as digits as its factorization.

1661342682500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664537097 (or 664537080 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 1661342682500 in words is "one trillion, six hundred sixty-one billion, three hundred forty-two million, six hundred eighty-two thousand, five hundred".