249999999999999 has 8 divisors (see below), whose sum is σ = 334419109664640. Its totient is φ = 166123778501016.

The previous prime is 249999999999977. The next prime is 250000000000043. The reversal of 249999999999999 is 999999999999942.

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

It is not a de Polignac number, because 249999999999999 - 2¹² = 249999999995903 is a prime.

It is a super-9 number, since 9×249999999999999⁹ (a number of 131 digits) contains 999999999 as substring.

249999999999999 is a modest number, since divided by 99999999 gives 2499999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249999999999499) 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, 135722040339 + ... + 135722042180.

It is an arithmetic number, because the mean of its divisors is an integer number (41802388708080).

Almost surely, 2^{249999999999999} is an apocalyptic number.

249999999999999 is a deficient number, since it is larger than the sum of its proper divisors (84419109664641).

249999999999999 is a wasteful number, since it uses less digits than its factorization.

249999999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271444082829.

The product of its digits is 20334926626632, while the sum is 123.

The spelling of 249999999999999 in words is "two hundred forty-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".