1206904901957 has 2 divisors, whose sum is σ = 1206904901958. Its totient is φ = 1206904901956.

The previous prime is 1206904901929. The next prime is 1206904901963. The reversal of 1206904901957 is 7591094096021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758003561956 + 448901340001 = 870634^2 + 670001^2 .

It is an emirp because it is prime and its reverse (7591094096021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1206904901957 - 2⁸ = 1206904901701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1206904901899 and 1206904901908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1206904901357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603452450978 + 603452450979.

It is an arithmetic number, because the mean of its divisors is an integer number (603452450979).

Almost surely, 2^{1206904901957} is an apocalyptic number.

It is an amenable number.

1206904901957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206904901957 is an equidigital number, since it uses as much as digits as its factorization.

1206904901957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 53.

Adding to 1206904901957 its reverse (7591094096021), we get a palindrome (8797998997978).

The spelling of 1206904901957 in words is "one trillion, two hundred six billion, nine hundred four million, nine hundred one thousand, nine hundred fifty-seven".