15518942494 has 8 divisors (see below), whose sum is σ = 25394633208. Its totient is φ = 7054064760.

The previous prime is 15518942489. The next prime is 15518942497. The reversal of 15518942494 is 49424981551.

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

It is a super-2 number, since 2×15518942494² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15518942497) 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, 352703217 + ... + 352703260.

It is an arithmetic number, because the mean of its divisors is an integer number (3174329151).

Almost surely, 2^15518942494 is an apocalyptic number.

15518942494 is a deficient number, since it is larger than the sum of its proper divisors (9875690714).

15518942494 is a wasteful number, since it uses less digits than its factorization.

15518942494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705406490.

The product of its digits is 2073600, while the sum is 52.

The spelling of 15518942494 in words is "fifteen billion, five hundred eighteen million, nine hundred forty-two thousand, four hundred ninety-four".