1261681939200 has 108 divisors (see below), whose sum is σ = 4163813313128. Its totient is φ = 336448512000.

The previous prime is 1261681939157. The next prime is 1261681939249. The reversal of 1261681939200 is 29391861621.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1261681939200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32837101 + ... + 32875500.

Almost surely, 2^{1261681939200} is an apocalyptic number.

1261681939200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261681939200 is an abundant number, since it is smaller than the sum of its proper divisors (2902131373928).

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

1261681939200 is an equidigital number, since it uses as much as digits as its factorization.

1261681939200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65712630 (or 65712611 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 1261681939200 in words is "one trillion, two hundred sixty-one billion, six hundred eighty-one million, nine hundred thirty-nine thousand, two hundred".