7621646437 has 2 divisors, whose sum is σ = 7621646438. Its totient is φ = 7621646436.

The previous prime is 7621646419. The next prime is 7621646489. The reversal of 7621646437 is 7346461267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7492460481 + 129185956 = 86559^2 + 11366^2 .

It is a cyclic number.

It is not a de Polignac number, because 7621646437 - 2⁷ = 7621646309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7621640437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810823218 + 3810823219.

It is an arithmetic number, because the mean of its divisors is an integer number (3810823219).

Almost surely, 2^7621646437 is an apocalyptic number.

It is an amenable number.

7621646437 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621646437 is an equidigital number, since it uses as much as digits as its factorization.

7621646437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 46.

The square root of 7621646437 is about 87302.0414251580. The cubic root of 7621646437 is about 1967.9599964224.

The spelling of 7621646437 in words is "seven billion, six hundred twenty-one million, six hundred forty-six thousand, four hundred thirty-seven".