691861166290 has 16 divisors (see below), whose sum is σ = 1423257256512. Its totient is φ = 237209542704.

The previous prime is 691861166281. The next prime is 691861166291. The reversal of 691861166290 is 92661168196.

It is not an unprimeable number, because it can be changed into a prime (691861166291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4941865404 + ... + 4941865543.

It is an arithmetic number, because the mean of its divisors is an integer number (88953578532).

Almost surely, 2^691861166290 is an apocalyptic number.

691861166290 is an abundant number, since it is smaller than the sum of its proper divisors (731396090222).

691861166290 is a wasteful number, since it uses less digits than its factorization.

691861166290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9883730961.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 691861166290 in words is "six hundred ninety-one billion, eight hundred sixty-one million, one hundred sixty-six thousand, two hundred ninety".