19486157797440 has 168 divisors, whose sum is σ = 70966867509720. Its totient is φ = 4890643513344.

The previous prime is 19486157797439. The next prime is 19486157797471. The reversal of 19486157797440 is 4479775168491.

19486157797440 is a `hidden beast` number, since 1 + 9 + 4 + 8 + 6 + 1 + 577 + 9 + 7 + 4 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4389762470976 + 15096395326464 = 2095176^2 + 3885408^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 198951835 + ... + 199049754.

It is an arithmetic number, because the mean of its divisors is an integer number (422421830415).

Almost surely, 2^{19486157797440} is an apocalyptic number.

19486157797440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19486157797440 is an abundant number, since it is smaller than the sum of its proper divisors (51480709712280).

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

19486157797440 is a wasteful number, since it uses less digits than its factorization.

19486157797440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398001629 (or 398001616 counting only the distinct ones).

The product of its (nonzero) digits is 426746880, while the sum is 72.

The spelling of 19486157797440 in words is "nineteen trillion, four hundred eighty-six billion, one hundred fifty-seven million, seven hundred ninety-seven thousand, four hundred forty".