690866556629 has 4 divisors (see below), whose sum is σ = 696980420076. Its totient is φ = 684752693184.

The previous prime is 690866556593. The next prime is 690866556631. The reversal of 690866556629 is 926655668096.

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 8628552100 + 682238004529 = 92890^2 + 825977^2 .

It is a cyclic number.

It is not a de Polignac number, because 690866556629 - 2¹² = 690866552533 is a prime.

It is a super-2 number, since 2×690866556629² (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 (690866556649) 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, 3056931554 + ... + 3056931779.

It is an arithmetic number, because the mean of its divisors is an integer number (174245105019).

Almost surely, 2^690866556629 is an apocalyptic number.

It is an amenable number.

690866556629 is a deficient number, since it is larger than the sum of its proper divisors (6113863447).

690866556629 is a wasteful number, since it uses less digits than its factorization.

690866556629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113863446.

The product of its (nonzero) digits is 251942400, while the sum is 68.

The spelling of 690866556629 in words is "six hundred ninety billion, eight hundred sixty-six million, five hundred fifty-six thousand, six hundred twenty-nine".