245712081919 has 4 divisors (see below), whose sum is σ = 254184912360. Its totient is φ = 237239251480.

The previous prime is 245712081917. The next prime is 245712081949. The reversal of 245712081919 is 919180217542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245712081919 - 2¹ = 245712081917 is a prime.

It is a super-2 number, since 2×245712081919² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245712081917) 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, 4236415177 + ... + 4236415234.

It is an arithmetic number, because the mean of its divisors is an integer number (63546228090).

Almost surely, 2^245712081919 is an apocalyptic number.

245712081919 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

245712081919 is a deficient number, since it is larger than the sum of its proper divisors (8472830441).

245712081919 is an equidigital number, since it uses as much as digits as its factorization.

245712081919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8472830440.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 245712081919 in words is "two hundred forty-five billion, seven hundred twelve million, eighty-one thousand, nine hundred nineteen".