7618372661 has 2 divisors, whose sum is σ = 7618372662. Its totient is φ = 7618372660.

The previous prime is 7618372607. The next prime is 7618372669. The reversal of 7618372661 is 1662738167.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6372988561 + 1245384100 = 79831^2 + 35290^2 .

It is a cyclic number.

It is not a de Polignac number, because 7618372661 - 2¹⁸ = 7618110517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7618372669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3809186330 + 3809186331.

It is an arithmetic number, because the mean of its divisors is an integer number (3809186331).

Almost surely, 2^7618372661 is an apocalyptic number.

It is an amenable number.

7618372661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7618372661 is an equidigital number, since it uses as much as digits as its factorization.

7618372661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 7618372661 is about 87283.2897008356. The cubic root of 7618372661 is about 1967.6781857957.

The spelling of 7618372661 in words is "seven billion, six hundred eighteen million, three hundred seventy-two thousand, six hundred sixty-one".