1664098197726 has 32 divisors (see below), whose sum is σ = 3525820980480. Its totient is φ = 521796196736.

The previous prime is 1664098197691. The next prime is 1664098197733. The reversal of 1664098197726 is 6277918904661.

It is a Curzon number.

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, 4083066 + ... + 4472093.

It is an arithmetic number, because the mean of its divisors is an integer number (110181905640).

Almost surely, 2^{1664098197726} is an apocalyptic number.

1664098197726 is an abundant number, since it is smaller than the sum of its proper divisors (1861722782754).

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

1664098197726 is a wasteful number, since it uses less digits than its factorization.

1664098197726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8557088.

The product of its (nonzero) digits is 54867456, while the sum is 66.

The spelling of 1664098197726 in words is "one trillion, six hundred sixty-four billion, ninety-eight million, one hundred ninety-seven thousand, seven hundred twenty-six".