1331620523436 has 96 divisors (see below), whose sum is σ = 3791934074880. Its totient is φ = 355493779200.

The previous prime is 1331620523423. The next prime is 1331620523501. The reversal of 1331620523436 is 6343250261331.

It is a junction number, because it is equal to n+sod(n) for n = 1331620523394 and 1331620523403.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 8741295 + ... + 8892326.

It is an arithmetic number, because the mean of its divisors is an integer number (39499313280).

Almost surely, 2^{1331620523436} is an apocalyptic number.

It is an amenable number.

1331620523436 is an abundant number, since it is smaller than the sum of its proper divisors (2460313551444).

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

1331620523436 is a wasteful number, since it uses less digits than its factorization.

1331620523436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17633695 (or 17633693 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 39.

Adding to 1331620523436 its reverse (6343250261331), we get a palindrome (7674870784767).

The spelling of 1331620523436 in words is "one trillion, three hundred thirty-one billion, six hundred twenty million, five hundred twenty-three thousand, four hundred thirty-six".