1955942657 has 2 divisors, whose sum is σ = 1955942658. Its totient is φ = 1955942656.

The previous prime is 1955942627. The next prime is 1955942683. The reversal of 1955942657 is 7562495591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1851064576 + 104878081 = 43024^2 + 10241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955942657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1955942599 and 1955942608.

It is not a weakly prime, because it can be changed into another prime (1955942627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 977971328 + 977971329.

It is an arithmetic number, because the mean of its divisors is an integer number (977971329).

Almost surely, 2^1955942657 is an apocalyptic number.

It is an amenable number.

1955942657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1955942657 is an equidigital number, since it uses as much as digits as its factorization.

1955942657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402000, while the sum is 53.

The square root of 1955942657 is about 44226.0404852164. The cubic root of 1955942657 is about 1250.6008113343.

The spelling of 1955942657 in words is "one billion, nine hundred fifty-five million, nine hundred forty-two thousand, six hundred fifty-seven".