7212615653 has 4 divisors (see below), whose sum is σ = 7636887180. Its totient is φ = 6788344128.

The previous prime is 7212615649. The next prime is 7212615659. The reversal of 7212615653 is 3565162127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3565162127 = 23 ⋅155007049.

It can be written as a sum of positive squares in 2 ways, for example, as 2237006209 + 4975609444 = 47297^2 + 70538^2 .

It is a cyclic number.

It is not a de Polignac number, because 7212615653 - 2² = 7212615649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7212615659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212135738 + ... + 212135771.

It is an arithmetic number, because the mean of its divisors is an integer number (1909221795).

Almost surely, 2^7212615653 is an apocalyptic number.

It is an amenable number.

7212615653 is a deficient number, since it is larger than the sum of its proper divisors (424271527).

7212615653 is a wasteful number, since it uses less digits than its factorization.

7212615653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424271526.

The product of its digits is 75600, while the sum is 38.

The square root of 7212615653 is about 84927.1196556200. The cubic root of 7212615653 is about 1932.1059147648.

The spelling of 7212615653 in words is "seven billion, two hundred twelve million, six hundred fifteen thousand, six hundred fifty-three".