699917137920 has 2304 divisors, whose sum is σ = 3389650467840. Its totient is φ = 133772083200.

The previous prime is 699917137897. The next prime is 699917137951. The reversal of 699917137920 is 29731719996.

699917137920 is a `hidden beast` number, since 6 + 9 + 99 + 171 + 379 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2304).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2490808180 + ... + 2490808460.

It is an arithmetic number, because the mean of its divisors is an integer number (1471202460).

Almost surely, 2^699917137920 is an apocalyptic number.

699917137920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 699917137920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1694825233920).

699917137920 is an abundant number, since it is smaller than the sum of its proper divisors (2689733329920).

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

699917137920 is a wasteful number, since it uses less digits than its factorization.

699917137920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 11573604, while the sum is 63.

The spelling of 699917137920 in words is "six hundred ninety-nine billion, nine hundred seventeen million, one hundred thirty-seven thousand, nine hundred twenty".