699609724381 has 4 divisors (see below), whose sum is σ = 700047803452. Its totient is φ = 699171645312.

The previous prime is 699609724351. The next prime is 699609724391. The reversal of 699609724381 is 183427906996.

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

It can be written as a sum of positive squares in 2 ways, for example, as 105554161881 + 594055562500 = 324891^2 + 770750^2 .

It is a cyclic number.

It is not a de Polignac number, because 699609724381 - 2²³ = 699601335773 is a prime.

It is a super-2 number, since 2×699609724381² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (699609724321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219037140 + ... + 219040333.

It is an arithmetic number, because the mean of its divisors is an integer number (175011950863).

Almost surely, 2^699609724381 is an apocalyptic number.

It is an amenable number.

699609724381 is a deficient number, since it is larger than the sum of its proper divisors (438079071).

699609724381 is a wasteful number, since it uses less digits than its factorization.

699609724381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438079070.

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 699609724381 in words is "six hundred ninety-nine billion, six hundred nine million, seven hundred twenty-four thousand, three hundred eighty-one".