1261500116004 has 72 divisors (see below), whose sum is σ = 3223689460992. Its totient is φ = 415922083200.

The previous prime is 1261500116003. The next prime is 1261500116027. The reversal of 1261500116004 is 4006110051621.

1261500116004 is a `hidden beast` number, since 1 + 2 + 6 + 1 + 50 + 0 + 1 + 1 + 600 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1261500116003) 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 23 ways as a sum of consecutive naturals, for example, 768597 + ... + 1764579.

It is an arithmetic number, because the mean of its divisors is an integer number (44773464736).

Almost surely, 2^{1261500116004} is an apocalyptic number.

It is an amenable number.

1261500116004 is an abundant number, since it is smaller than the sum of its proper divisors (1962189344988).

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

1261500116004 is a wasteful number, since it uses less digits than its factorization.

1261500116004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996377 (or 996372 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 1261500116004 its reverse (4006110051621), we get a palindrome (5267610167625).

The spelling of 1261500116004 in words is "one trillion, two hundred sixty-one billion, five hundred million, one hundred sixteen thousand, four".