691944698894 has 32 divisors (see below), whose sum is σ = 1053879802560. Its totient is φ = 340694035200.

The previous prime is 691944698881. The next prime is 691944698911. The reversal of 691944698894 is 498896449196.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29967434 + ... + 29990514.

It is an arithmetic number, because the mean of its divisors is an integer number (32933743830).

Almost surely, 2^691944698894 is an apocalyptic number.

691944698894 is a deficient number, since it is larger than the sum of its proper divisors (361935103666).

691944698894 is a wasteful number, since it uses less digits than its factorization.

691944698894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23996.

The product of its digits is 967458816, while the sum is 77.

The spelling of 691944698894 in words is "six hundred ninety-one billion, nine hundred forty-four million, six hundred ninety-eight thousand, eight hundred ninety-four".