1561021500612 has 96 divisors (see below), whose sum is σ = 4413339212800. Its totient is φ = 419492276352.

The previous prime is 1561021500611. The next prime is 1561021500653. The reversal of 1561021500612 is 2160051201651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561021500612.

It is not an unprimeable number, because it can be changed into a prime (1561021500611) 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 31 ways as a sum of consecutive naturals, for example, 3296443 + ... + 3740130.

Almost surely, 2^{1561021500612} is an apocalyptic number.

1561021500612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561021500612 is an abundant number, since it is smaller than the sum of its proper divisors (2852317712188).

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

1561021500612 is a wasteful number, since it uses less digits than its factorization.

1561021500612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036745 (or 7036743 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 1561021500612 in words is "one trillion, five hundred sixty-one billion, twenty-one million, five hundred thousand, six hundred twelve".