1561551050100 has 72 divisors (see below), whose sum is σ = 4623159550240. Its totient is φ = 406729572480.

The previous prime is 1561551050099. The next prime is 1561551050119. The reversal of 1561551050100 is 10501551651.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60512335 + ... + 60538134.

Almost surely, 2^{1561551050100} is an apocalyptic number.

1561551050100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561551050100 is an abundant number, since it is smaller than the sum of its proper divisors (3061608500140).

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

1561551050100 is a wasteful number, since it uses less digits than its factorization.

1561551050100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121050529 (or 121050522 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 30.

The spelling of 1561551050100 in words is "one trillion, five hundred sixty-one billion, five hundred fifty-one million, fifty thousand, one hundred".