1243630555780 has 48 divisors (see below), whose sum is σ = 2680268416560. Its totient is φ = 484421990400.

The previous prime is 1243630555723. The next prime is 1243630555789. The reversal of 1243630555780 is 875550363421.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 48819786304 + 1194810769476 = 220952^2 + 1093074^2 .

It is not an unprimeable number, because it can be changed into a prime (1243630555789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 958065 + ... + 1845304.

It is an arithmetic number, because the mean of its divisors is an integer number (55838925345).

Almost surely, 2^{1243630555780} is an apocalyptic number.

1243630555780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243630555780 is an abundant number, since it is smaller than the sum of its proper divisors (1436637860780).

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

1243630555780 is a wasteful number, since it uses less digits than its factorization.

1243630555780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803960 (or 2803958 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 1243630555780 in words is "one trillion, two hundred forty-three billion, six hundred thirty million, five hundred fifty-five thousand, seven hundred eighty".