999696645 has 48 divisors (see below), whose sum is σ = 1879546032. Its totient is φ = 489553920.

The previous prime is 999696641. The next prime is 999696667. The reversal of 999696645 is 546696999.

It can be written as a sum of positive squares in 8 ways, for example, as 120099681 + 879596964 = 10959^2 + 29658^2 .

It is not a de Polignac number, because 999696645 - 2² = 999696641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999696641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15429 + ... + 47301.

It is an arithmetic number, because the mean of its divisors is an integer number (39157209).

Almost surely, 2^999696645 is an apocalyptic number.

It is an amenable number.

999696645 is a deficient number, since it is larger than the sum of its proper divisors (879849387).

999696645 is a wasteful number, since it uses less digits than its factorization.

999696645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31942 (or 31939 counting only the distinct ones).

The product of its digits is 28343520, while the sum is 63.

The square root of 999696645 is about 31617.9797741728. The cubic root of 999696645 is about 999.8988714400.

The spelling of 999696645 in words is "nine hundred ninety-nine million, six hundred ninety-six thousand, six hundred forty-five".