18757971497461 has 4 divisors (see below), whose sum is σ = 21437681711392. Its totient is φ = 16078261283532.

The previous prime is 18757971497453. The next prime is 18757971497533. The reversal of 18757971497461 is 16479417975781.

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 18757971497461 - 2³ = 18757971497453 is a prime.

It is a super-2 number, since 2×18757971497461² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18757971492461) 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, 1339855106955 + ... + 1339855106968.

It is an arithmetic number, because the mean of its divisors is an integer number (5359420427848).

Almost surely, 2^{18757971497461} is an apocalyptic number.

It is an amenable number.

18757971497461 is a deficient number, since it is larger than the sum of its proper divisors (2679710213931).

18757971497461 is an equidigital number, since it uses as much as digits as its factorization.

18757971497461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679710213930.

The product of its digits is 746807040, while the sum is 76.

The spelling of 18757971497461 in words is "eighteen trillion, seven hundred fifty-seven billion, nine hundred seventy-one million, four hundred ninety-seven thousand, four hundred sixty-one".