19537983791481 has 4 divisors (see below), whose sum is σ = 26050645055312. Its totient is φ = 13025322527652.

The previous prime is 19537983791419. The next prime is 19537983791507. The reversal of 19537983791481 is 18419738973591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 19537983791481 - 2²⁶ = 19537916682617 is a prime.

It is a super-2 number, since 2×19537983791481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19537983711481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256330631911 + ... + 3256330631916.

It is an arithmetic number, because the mean of its divisors is an integer number (6512661263828).

Almost surely, 2^{19537983791481} is an apocalyptic number.

It is an amenable number.

19537983791481 is a deficient number, since it is larger than the sum of its proper divisors (6512661263831).

19537983791481 is an equidigital number, since it uses as much as digits as its factorization.

19537983791481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6512661263830.

The product of its digits is 411505920, while the sum is 75.

The spelling of 19537983791481 in words is "nineteen trillion, five hundred thirty-seven billion, nine hundred eighty-three million, seven hundred ninety-one thousand, four hundred eighty-one".