19971505742188 has 96 divisors (see below), whose sum is σ = 47044260845568. Its totient is φ = 7164466848000.

The previous prime is 19971505742179. The next prime is 19971505742231. The reversal of 19971505742188 is 88124750517991.

It is a super-2 number, since 2×19971505742188² (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 31 ways as a sum of consecutive naturals, for example, 4692388 + ... + 7871563.

It is an arithmetic number, because the mean of its divisors is an integer number (490044383808).

Almost surely, 2^{19971505742188} is an apocalyptic number.

It is an amenable number.

19971505742188 is an abundant number, since it is smaller than the sum of its proper divisors (27072755103380).

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

19971505742188 is a wasteful number, since it uses less digits than its factorization.

19971505742188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12564383 (or 12564381 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 67.

The spelling of 19971505742188 in words is "nineteen trillion, nine hundred seventy-one billion, five hundred five million, seven hundred forty-two thousand, one hundred eighty-eight".