691894000550 has 24 divisors (see below), whose sum is σ = 1342876010256. Its totient is φ = 264724660640.

The previous prime is 691894000537. The next prime is 691894000559. The reversal of 691894000550 is 55000498196.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 691894000495 and 691894000504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (691894000559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300822329 + ... + 300824628.

It is an arithmetic number, because the mean of its divisors is an integer number (55953167094).

Almost surely, 2^691894000550 is an apocalyptic number.

691894000550 is a deficient number, since it is larger than the sum of its proper divisors (650982009706).

691894000550 is a wasteful number, since it uses less digits than its factorization.

691894000550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601646992 (or 601646987 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 691894000550 in words is "six hundred ninety-one billion, eight hundred ninety-four million, five hundred fifty", and thus it is an aban number.