2774401661 has 2 divisors, whose sum is σ = 2774401662. Its totient is φ = 2774401660.

The previous prime is 2774401613. The next prime is 2774401697. The reversal of 2774401661 is 1661044772.

It is a happy number.

2774401661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2614379161 + 160022500 = 51131^2 + 12650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2774401661 - 2¹⁴ = 2774385277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2774461661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1387200830 + 1387200831.

It is an arithmetic number, because the mean of its divisors is an integer number (1387200831).

Almost surely, 2^2774401661 is an apocalyptic number.

It is an amenable number.

2774401661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2774401661 is an equidigital number, since it uses as much as digits as its factorization.

2774401661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 2774401661 is about 52672.5892756375. The cubic root of 2774401661 is about 1405.1513725199.

The spelling of 2774401661 in words is "two billion, seven hundred seventy-four million, four hundred one thousand, six hundred sixty-one".