49999999999 has 4 divisors (see below), whose sum is σ = 51724137960. Its totient is φ = 48275862040.

The previous prime is 49999999967. The next prime is 50000000021. The reversal of 49999999999 is 99999999994.

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

It is a cyclic number.

It is a trimorphic number since its cube, 124999999992500000000149999999999, ends in 49999999999.

It is not a de Polignac number, because 49999999999 - 2⁵ = 49999999967 is a prime.

It is a super-9 number, since 9×49999999999⁹ (a number of 98 digits) contains 999999999 as substring.

It is a Duffinian number.

49999999999 is a modest number, since divided by 999999 gives 49999 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 (49999999199) 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, 862068937 + ... + 862068994.

It is an arithmetic number, because the mean of its divisors is an integer number (12931034490).

Almost surely, 2^49999999999 is an apocalyptic number.

49999999999 is a deficient number, since it is larger than the sum of its proper divisors (1724137961).

49999999999 is a wasteful number, since it uses less digits than its factorization.

49999999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724137960.

The product of its digits is 13947137604, while the sum is 94.

The spelling of 49999999999 in words is "forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".