99758978894 has 4 divisors (see below), whose sum is σ = 149638468344. Its totient is φ = 49879489446.

The previous prime is 99758978831. The next prime is 99758978899. The reversal of 99758978894 is 49887985799.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99758978899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24939744722 + ... + 24939744725.

It is an arithmetic number, because the mean of its divisors is an integer number (37409617086).

Almost surely, 2^99758978894 is an apocalyptic number.

99758978894 is a deficient number, since it is larger than the sum of its proper divisors (49879489450).

99758978894 is a wasteful number, since it uses less digits than its factorization.

99758978894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49879489449.

The product of its digits is 3292047360, while the sum is 83.

The spelling of 99758978894 in words is "ninety-nine billion, seven hundred fifty-eight million, nine hundred seventy-eight thousand, eight hundred ninety-four".