2567949661 has 2 divisors, whose sum is σ = 2567949662. Its totient is φ = 2567949660.

The previous prime is 2567949649. The next prime is 2567949673. The reversal of 2567949661 is 1669497652.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (2567949649) and next prime (2567949673).

It can be written as a sum of positive squares in only one way, i.e., 1712387161 + 855562500 = 41381^2 + 29250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2567949661 - 2¹³ = 2567941469 is a prime.

It is a super-2 number, since 2×2567949661² = 13188730922860029842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2567949611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283974830 + 1283974831.

It is an arithmetic number, because the mean of its divisors is an integer number (1283974831).

Almost surely, 2^2567949661 is an apocalyptic number.

It is an amenable number.

2567949661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2567949661 is an equidigital number, since it uses as much as digits as its factorization.

2567949661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 55.

The square root of 2567949661 is about 50674.9411543812. The cubic root of 2567949661 is about 1369.3953075794.

The spelling of 2567949661 in words is "two billion, five hundred sixty-seven million, nine hundred forty-nine thousand, six hundred sixty-one".