690705571901 has 2 divisors, whose sum is σ = 690705571902. Its totient is φ = 690705571900.

The previous prime is 690705571889. The next prime is 690705571967. The reversal of 690705571901 is 109175507096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653067631876 + 37637940025 = 808126^2 + 194005^2 .

It is a cyclic number.

It is not a de Polignac number, because 690705571901 - 2¹⁴ = 690705555517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 690705571901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690705571301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345352785950 + 345352785951.

It is an arithmetic number, because the mean of its divisors is an integer number (345352785951).

Almost surely, 2^690705571901 is an apocalyptic number.

It is an amenable number.

690705571901 is a deficient number, since it is larger than the sum of its proper divisors (1).

690705571901 is an equidigital number, since it uses as much as digits as its factorization.

690705571901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 595350, while the sum is 50.

The spelling of 690705571901 in words is "six hundred ninety billion, seven hundred five million, five hundred seventy-one thousand, nine hundred one".