690748021759 has 2 divisors, whose sum is σ = 690748021760. Its totient is φ = 690748021758.

The previous prime is 690748021757. The next prime is 690748021763. The reversal of 690748021759 is 957120847096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690748021759 - 2¹ = 690748021757 is a prime.

Together with 690748021757, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690748021757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345374010879 + 345374010880.

It is an arithmetic number, because the mean of its divisors is an integer number (345374010880).

Almost surely, 2^690748021759 is an apocalyptic number.

690748021759 is a deficient number, since it is larger than the sum of its proper divisors (1).

690748021759 is an equidigital number, since it uses as much as digits as its factorization.

690748021759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 690748021759 in words is "six hundred ninety billion, seven hundred forty-eight million, twenty-one thousand, seven hundred fifty-nine".