2197358557801 has 27 divisors (see below), whose sum is σ = 2566034688567. Its totient is φ = 1879855707840.

The previous prime is 2197358557799. The next prime is 2197358557841. The reversal of 2197358557801 is 1087558537912.

It is a happy number.

The square root of 2197358557801 is 1482349.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1710746282025 + 486612275776 = 1307955^2 + 697576^2 .

It is not a de Polignac number, because 2197358557801 - 2¹ = 2197358557799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2197358557801.

It is not an unprimeable number, because it can be changed into a prime (2197358557841) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 277195300 + ... + 277203226.

Almost surely, 2^{2197358557801} is an apocalyptic number.

2197358557801 is the 1482349-th square number.

2197358557801 is the 741175-th centered octagonal number.

It is an amenable number.

2197358557801 is a deficient number, since it is larger than the sum of its proper divisors (368676130766).

2197358557801 is an frugal number, since it uses more digits than its factorization.

2197358557801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15910 (or 7955 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 61.

The spelling of 2197358557801 in words is "two trillion, one hundred ninety-seven billion, three hundred fifty-eight million, five hundred fifty-seven thousand, eight hundred one".