518207974949 has 4 divisors (see below), whose sum is σ = 592237685664. Its totient is φ = 444178264236.

The previous prime is 518207974919. The next prime is 518207974951. The reversal of 518207974949 is 949479702815.

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 518207974949 - 2¹⁶ = 518207909413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (518207974919) 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, 37014855347 + ... + 37014855360.

It is an arithmetic number, because the mean of its divisors is an integer number (148059421416).

Almost surely, 2^518207974949 is an apocalyptic number.

It is an amenable number.

518207974949 is a deficient number, since it is larger than the sum of its proper divisors (74029710715).

518207974949 is an equidigital number, since it uses as much as digits as its factorization.

518207974949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74029710714.

The product of its (nonzero) digits is 45722880, while the sum is 65.

The spelling of 518207974949 in words is "five hundred eighteen billion, two hundred seven million, nine hundred seventy-four thousand, nine hundred forty-nine".