690688881699 has 16 divisors (see below), whose sum is σ = 975157519392. Its totient is φ = 433343490048.

The previous prime is 690688881677. The next prime is 690688881703. The reversal of 690688881699 is 996188886096.

It is a happy number.

It is not a de Polignac number, because 690688881699 - 2¹² = 690688877603 is a prime.

It is a super-2 number, since 2×690688881699² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (690688881899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290127 + ... + 1210599.

It is an arithmetic number, because the mean of its divisors is an integer number (60947344962).

Almost surely, 2^690688881699 is an apocalyptic number.

690688881699 is a deficient number, since it is larger than the sum of its proper divisors (284468637693).

690688881699 is a wasteful number, since it uses less digits than its factorization.

690688881699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935206.

The product of its (nonzero) digits is 644972544, while the sum is 78.

The spelling of 690688881699 in words is "six hundred ninety billion, six hundred eighty-eight million, eight hundred eighty-one thousand, six hundred ninety-nine".