18971023693749 has 8 divisors (see below), whose sum is σ = 25302264738432. Its totient is φ = 12643565889120.

The previous prime is 18971023693717. The next prime is 18971023693753. The reversal of 18971023693749 is 94739632017981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18971023693749 - 2⁵ = 18971023693717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971023693799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 945798312 + ... + 945818369.

It is an arithmetic number, because the mean of its divisors is an integer number (3162783092304).

Almost surely, 2^{18971023693749} is an apocalyptic number.

It is an amenable number.

18971023693749 is a deficient number, since it is larger than the sum of its proper divisors (6331241044683).

18971023693749 is a wasteful number, since it uses less digits than its factorization.

18971023693749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891620027.

The product of its (nonzero) digits is 123451776, while the sum is 69.

The spelling of 18971023693749 in words is "eighteen trillion, nine hundred seventy-one billion, twenty-three million, six hundred ninety-three thousand, seven hundred forty-nine".