691220110102000 has 80 divisors (see below), whose sum is σ = 1671474328965792. Its totient is φ = 276470822745600.

The previous prime is 691220110101967. The next prime is 691220110102069. The reversal of 691220110102000 is 201011022196.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21378724 + ... + 42889276.

Almost surely, 2^{691220110102000} is an apocalyptic number.

It is an amenable number.

691220110102000 is an abundant number, since it is smaller than the sum of its proper divisors (980254218863792).

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

691220110102000 is a wasteful number, since it uses less digits than its factorization.

691220110102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21526643 (or 21526627 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 691220110102000 its reverse (201011022196), we get a palindrome (691421121124196).

The spelling of 691220110102000 in words is "six hundred ninety-one trillion, two hundred twenty billion, one hundred ten million, one hundred two thousand".