2621250661 has 2 divisors, whose sum is σ = 2621250662. Its totient is φ = 2621250660.

The previous prime is 2621250649. The next prime is 2621250673. The reversal of 2621250661 is 1660521262.

2621250661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (2621250649) and next prime (2621250673).

It can be written as a sum of positive squares in only one way, i.e., 1458781636 + 1162469025 = 38194^2 + 34095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621250661 - 2¹³ = 2621242469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2621250061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310625330 + 1310625331.

It is an arithmetic number, because the mean of its divisors is an integer number (1310625331).

Almost surely, 2^2621250661 is an apocalyptic number.

It is an amenable number.

2621250661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621250661 is an equidigital number, since it uses as much as digits as its factorization.

2621250661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2621250661 is about 51198.1509529397. The cubic root of 2621250661 is about 1378.8050043278.

The spelling of 2621250661 in words is "two billion, six hundred twenty-one million, two hundred fifty thousand, six hundred sixty-one".