1264165171201 has 3 divisors (see below), whose sum is σ = 1264166295553. Its totient is φ = 1264164046850.

The previous prime is 1264165171189. The next prime is 1264165171271. The reversal of 1264165171201 is 1021715614621.

The square root of 1264165171201 is 1124351.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-1264165171201 is a prime.

It is a super-2 number, since 2×1264165171201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264165171271) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 562176 + ... + 1686526.

Almost surely, 2^{1264165171201} is an apocalyptic number.

1264165171201 is the 1124351-st square number.

1264165171201 is the 562176-th centered octagonal number.

It is an amenable number.

1264165171201 is a deficient number, since it is larger than the sum of its proper divisors (1124352).

1264165171201 is an frugal number, since it uses more digits than its factorization.

1264165171201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248702 (or 1124351 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 37.

The spelling of 1264165171201 in words is "one trillion, two hundred sixty-four billion, one hundred sixty-five million, one hundred seventy-one thousand, two hundred one".