7612216561 has 4 divisors (see below), whose sum is σ = 7622518000. Its totient is φ = 7601915124.

The previous prime is 7612216543. The next prime is 7612216589. The reversal of 7612216561 is 1656122167.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7612216561 - 2¹⁵ = 7612183793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7612216561.

It is not an unprimeable number, because it can be changed into a prime (7612276561) 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, 5149611 + ... + 5151088.

It is an arithmetic number, because the mean of its divisors is an integer number (1905629500).

Almost surely, 2^7612216561 is an apocalyptic number.

It is an amenable number.

7612216561 is a deficient number, since it is larger than the sum of its proper divisors (10301439).

7612216561 is a wasteful number, since it uses less digits than its factorization.

7612216561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301438.

The product of its digits is 30240, while the sum is 37.

The square root of 7612216561 is about 87248.0175190245. The cubic root of 7612216561 is about 1967.1480424864.

The spelling of 7612216561 in words is "seven billion, six hundred twelve million, two hundred sixteen thousand, five hundred sixty-one".