1261500436000 has 192 divisors, whose sum is σ = 3750664829184. Its totient is φ = 407072256000.

The previous prime is 1261500435931. The next prime is 1261500436003. The reversal of 1261500436000 is 6340051621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 1261500436000.

It is not an unprimeable number, because it can be changed into a prime (1261500436003) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 849106 + ... + 1801105.

It is an arithmetic number, because the mean of its divisors is an integer number (19534712652).

Almost surely, 2^{1261500436000} is an apocalyptic number.

1261500436000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261500436000 is an abundant number, since it is smaller than the sum of its proper divisors (2489164393184).

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

1261500436000 is a wasteful number, since it uses less digits than its factorization.

1261500436000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650260 (or 2650242 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 1261500436000 its reverse (6340051621), we get a palindrome (1267840487621).

The spelling of 1261500436000 in words is "one trillion, two hundred sixty-one billion, five hundred million, four hundred thirty-six thousand".