19551351299481 has 15 divisors (see below), whose sum is σ = 29206399042821. Its totient is φ = 13034207669508.

The previous prime is 19551351299479. The next prime is 19551351299503. The reversal of 19551351299481 is 18499215315591.

The square root of 19551351299481 is 4421691.

It is a perfect power (a square), and thus also a powerful number.

19551351299481 is a `hidden beast` number, since 1 + 9 + 5 + 5 + 13 + 51 + 2 + 99 + 481 = 666.

It is not a de Polignac number, because 19551351299481 - 2¹ = 19551351299479 is a prime.

It is a super-2 number, since 2×19551351299481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19551351299401) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 39549570 + ... + 40040868.

Almost surely, 2^{19551351299481} is an apocalyptic number.

19551351299481 is the 4421691-st square number.

19551351299481 is the 2210846-th centered octagonal number.

It is an amenable number.

19551351299481 is a deficient number, since it is larger than the sum of its proper divisors (9655047743340).

19551351299481 is an frugal number, since it uses more digits than its factorization.

19551351299481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982610 (or 491302 counting only the distinct ones).

The product of its digits is 17496000, while the sum is 63.

The spelling of 19551351299481 in words is "nineteen trillion, five hundred fifty-one billion, three hundred fifty-one million, two hundred ninety-nine thousand, four hundred eighty-one".