99779566407 has 8 divisors (see below), whose sum is σ = 133256454384. Its totient is φ = 66411194688.

The previous prime is 99779566343. The next prime is 99779566409. The reversal of 99779566407 is 70466597799.

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

It is not a de Polignac number, because 99779566407 - 2⁶ = 99779566343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99779566409) 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, 27126918 + ... + 27130595.

It is an arithmetic number, because the mean of its divisors is an integer number (16657056798).

Almost surely, 2^99779566407 is an apocalyptic number.

99779566407 is a deficient number, since it is larger than the sum of its proper divisors (33476887977).

99779566407 is a wasteful number, since it uses less digits than its factorization.

99779566407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54258129.

The product of its (nonzero) digits is 180033840, while the sum is 69.

The spelling of 99779566407 in words is "ninety-nine billion, seven hundred seventy-nine million, five hundred sixty-six thousand, four hundred seven".