685491156798 has 32 divisors (see below), whose sum is σ = 1567064309760. Its totient is φ = 195826193760.

The previous prime is 685491156793. The next prime is 685491156863. The reversal of 685491156798 is 897651194586.

It is a super-3 number, since 3×685491156798³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685491156793) 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, 890553 + ... + 1471076.

It is an arithmetic number, because the mean of its divisors is an integer number (48970759680).

Almost surely, 2^685491156798 is an apocalyptic number.

685491156798 is an abundant number, since it is smaller than the sum of its proper divisors (881573152962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685491156798 is a wasteful number, since it uses less digits than its factorization.

685491156798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368552.

The product of its digits is 130636800, while the sum is 69.

The spelling of 685491156798 in words is "six hundred eighty-five billion, four hundred ninety-one million, one hundred fifty-six thousand, seven hundred ninety-eight".