4099961680 has 40 divisors (see below), whose sum is σ = 9626810184. Its totient is φ = 1623744000.

The previous prime is 4099961641. The next prime is 4099961713. The reversal of 4099961680 is 861699904.

It can be written as a sum of positive squares in 4 ways, for example, as 629809216 + 3470152464 = 25096^2 + 58908^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245631 + ... + 261790.

Almost surely, 2^4099961680 is an apocalyptic number.

4099961680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4099961680 is an abundant number, since it is smaller than the sum of its proper divisors (5526848504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4099961680 is a wasteful number, since it uses less digits than its factorization.

4099961680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507535 (or 507529 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 4099961680 is about 64030.9431447015. The cubic root of 4099961680 is about 1600.5156775301.

The spelling of 4099961680 in words is "four billion, ninety-nine million, nine hundred sixty-one thousand, six hundred eighty".