254157406661 has 2 divisors, whose sum is σ = 254157406662. Its totient is φ = 254157406660.

The previous prime is 254157406631. The next prime is 254157406687. The reversal of 254157406661 is 166604751452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244258350625 + 9899056036 = 494225^2 + 99494^2 .

It is a cyclic number.

It is not a de Polignac number, because 254157406661 - 2⁶ = 254157406597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254157406631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127078703330 + 127078703331.

It is an arithmetic number, because the mean of its divisors is an integer number (127078703331).

Almost surely, 2^254157406661 is an apocalyptic number.

It is an amenable number.

254157406661 is a deficient number, since it is larger than the sum of its proper divisors (1).

254157406661 is an equidigital number, since it uses as much as digits as its factorization.

254157406661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 254157406661 in words is "two hundred fifty-four billion, one hundred fifty-seven million, four hundred six thousand, six hundred sixty-one".