699808279381 has 2 divisors, whose sum is σ = 699808279382. Its totient is φ = 699808279380.

The previous prime is 699808279309. The next prime is 699808279409. The reversal of 699808279381 is 183972808996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554330877156 + 145477402225 = 744534^2 + 381415^2 .

It is a cyclic number.

It is not a de Polignac number, because 699808279381 - 2²³ = 699799890773 is a prime.

It is a super-2 number, since 2×699808279381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 699808279381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699808279081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349904139690 + 349904139691.

It is an arithmetic number, because the mean of its divisors is an integer number (349904139691).

Almost surely, 2^699808279381 is an apocalyptic number.

It is an amenable number.

699808279381 is a deficient number, since it is larger than the sum of its proper divisors (1).

699808279381 is an equidigital number, since it uses as much as digits as its factorization.

699808279381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 70.

The spelling of 699808279381 in words is "six hundred ninety-nine billion, eight hundred eight million, two hundred seventy-nine thousand, three hundred eighty-one".