78211012002601 has 3 divisors (see below), whose sum is σ = 78211020846301. Its totient is φ = 78211003158902.

The previous prime is 78211012002587. The next prime is 78211012002679. The reversal of 78211012002601 is 10620021011287.

The square root of 78211012002601 is 8843699.

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 not a de Polignac number, because 78211012002601 - 2¹¹ = 78211012000553 is a prime.

It is a super-2 number, since 2×78211012002601² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78211012002001) 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, 4421850 + ... + 13265548.

Almost surely, 2^{78211012002601} is an apocalyptic number.

78211012002601 is the 8843699-th square number.

78211012002601 is the 4421850-th centered octagonal number.

It is an amenable number.

78211012002601 is a deficient number, since it is larger than the sum of its proper divisors (8843700).

78211012002601 is an frugal number, since it uses more digits than its factorization.

78211012002601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17687398 (or 8843699 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 31.

Adding to 78211012002601 its reverse (10620021011287), we get a palindrome (88831033013888).

The spelling of 78211012002601 in words is "seventy-eight trillion, two hundred eleven billion, twelve million, two thousand, six hundred one".