7217777125 has 64 divisors (see below), whose sum is σ = 10325532672. Its totient is φ = 4990080000.

The previous prime is 7217777113. The next prime is 7217777141. The reversal of 7217777125 is 5217777127.

It is a happy number.

It is not a de Polignac number, because 7217777125 - 2²⁹ = 6680906213 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6270300 + ... + 6271450.

It is an arithmetic number, because the mean of its divisors is an integer number (161336448).

Almost surely, 2^7217777125 is an apocalyptic number.

It is an amenable number.

7217777125 is a deficient number, since it is larger than the sum of its proper divisors (3107755547).

7217777125 is a wasteful number, since it uses less digits than its factorization.

7217777125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1413 counting only the distinct ones).

The product of its digits is 336140, while the sum is 46.

The square root of 7217777125 is about 84957.5018759379. The cubic root of 7217777125 is about 1932.5666876278.

The spelling of 7217777125 in words is "seven billion, two hundred seventeen million, seven hundred seventy-seven thousand, one hundred twenty-five".