1223540501820 has 96 divisors (see below), whose sum is σ = 4216508825088. Its totient is φ = 258153599232.

The previous prime is 1223540501819. The next prime is 1223540501851. The reversal of 1223540501820 is 281050453221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112040374 + ... + 112051293.

It is an arithmetic number, because the mean of its divisors is an integer number (43921966928).

Almost surely, 2^{1223540501820} is an apocalyptic number.

1223540501820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223540501820 is an abundant number, since it is smaller than the sum of its proper divisors (2992968323268).

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

1223540501820 is a wasteful number, since it uses less digits than its factorization.

1223540501820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224091699 (or 224091697 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 1223540501820 in words is "one trillion, two hundred twenty-three billion, five hundred forty million, five hundred one thousand, eight hundred twenty".