1187655399280 has 40 divisors (see below), whose sum is σ = 3155770062432. Its totient is φ = 407196136704.

The previous prime is 1187655399269. The next prime is 1187655399289. The reversal of 1187655399280 is 829935567811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187655399289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060406047 + ... + 1060407166.

Almost surely, 2^{1187655399280} is an apocalyptic number.

1187655399280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1187655399280 is an abundant number, since it is smaller than the sum of its proper divisors (1968114663152).

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

1187655399280 is a wasteful number, since it uses less digits than its factorization.

1187655399280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120813233 (or 2120813227 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 1187655399280 in words is "one trillion, one hundred eighty-seven billion, six hundred fifty-five million, three hundred ninety-nine thousand, two hundred eighty".