99997966 has 4 divisors (see below), whose sum is σ = 149996952. Its totient is φ = 49998982.

The previous prime is 99997957. The next prime is 99997973. The reversal of 99997966 is 66979999.

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

It is a junction number, because it is equal to n+sod(n) for n = 99997898 and 99997907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999490 + ... + 24999493.

It is an arithmetic number, because the mean of its divisors is an integer number (37499238).

Almost surely, 2^99997966 is an apocalyptic number.

99997966 is a deficient number, since it is larger than the sum of its proper divisors (49998986).

99997966 is a wasteful number, since it uses less digits than its factorization.

99997966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49998985.

The product of its digits is 14880348, while the sum is 64.

The square root of 99997966 is about 9999.8982994829. The cubic root of 99997966 is about 464.1557363427.

The spelling of 99997966 in words is "ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-six".