19561855505962 has 72 divisors (see below), whose sum is σ = 37534615628832. Its totient is φ = 7618243968720.

The previous prime is 19561855505921. The next prime is 19561855505987. The reversal of 19561855505962 is 26950555816591.

It is a super-2 number, since 2×19561855505962² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 27479283 + ... + 28182169.

It is an arithmetic number, because the mean of its divisors is an integer number (521314105956).

Almost surely, 2^{19561855505962} is an apocalyptic number.

19561855505962 is a deficient number, since it is larger than the sum of its proper divisors (17972760122870).

19561855505962 is a wasteful number, since it uses less digits than its factorization.

19561855505962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705272 (or 705254 counting only the distinct ones).

The product of its (nonzero) digits is 145800000, while the sum is 67.

The spelling of 19561855505962 in words is "nineteen trillion, five hundred sixty-one billion, eight hundred fifty-five million, five hundred five thousand, nine hundred sixty-two".