7221651765 has 64 divisors (see below), whose sum is σ = 12927133440. Its totient is φ = 3421163520.

The previous prime is 7221651739. The next prime is 7221651781. The reversal of 7221651765 is 5671561227.

It is a happy number.

It is not a de Polignac number, because 7221651765 - 2¹¹ = 7221649717 is a prime.

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, 1339375 + ... + 1344755.

It is an arithmetic number, because the mean of its divisors is an integer number (201986460).

Almost surely, 2^7221651765 is an apocalyptic number.

It is an amenable number.

7221651765 is a deficient number, since it is larger than the sum of its proper divisors (5705481675).

7221651765 is a wasteful number, since it uses less digits than its factorization.

7221651765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5702.

The product of its digits is 176400, while the sum is 42.

The square root of 7221651765 is about 84980.3022176316. The cubic root of 7221651765 is about 1932.9124386146.

The spelling of 7221651765 in words is "seven billion, two hundred twenty-one million, six hundred fifty-one thousand, seven hundred sixty-five".