690609584381 has 2 divisors, whose sum is σ = 690609584382. Its totient is φ = 690609584380.

The previous prime is 690609584251. The next prime is 690609584453. The reversal of 690609584381 is 183485906096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379836783481 + 310772800900 = 616309^2 + 557470^2 .

It is a cyclic number.

It is not a de Polignac number, because 690609584381 - 2¹⁰ = 690609583357 is a prime.

It is a super-2 number, since 2×690609584381² (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 690609584381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690609544381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345304792190 + 345304792191.

It is an arithmetic number, because the mean of its divisors is an integer number (345304792191).

Almost surely, 2^690609584381 is an apocalyptic number.

It is an amenable number.

690609584381 is a deficient number, since it is larger than the sum of its proper divisors (1).

690609584381 is an equidigital number, since it uses as much as digits as its factorization.

690609584381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 690609584381 in words is "six hundred ninety billion, six hundred nine million, five hundred eighty-four thousand, three hundred eighty-one".