3851698028561 has 2 divisors, whose sum is σ = 3851698028562. Its totient is φ = 3851698028560.

The previous prime is 3851698028543. The next prime is 3851698028579. The reversal of 3851698028561 is 1658208961583.

It is a balanced prime because it is at equal distance from previous prime (3851698028543) and next prime (3851698028579).

It can be written as a sum of positive squares in only one way, i.e., 3729456192400 + 122241836161 = 1931180^2 + 349631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3851698028561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3851698028494 and 3851698028503.

It is not a weakly prime, because it can be changed into another prime (3851698018561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1925849014280 + 1925849014281.

It is an arithmetic number, because the mean of its divisors is an integer number (1925849014281).

Almost surely, 2^{3851698028561} is an apocalyptic number.

It is an amenable number.

3851698028561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3851698028561 is an equidigital number, since it uses as much as digits as its factorization.

3851698028561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24883200, while the sum is 62.

The spelling of 3851698028561 in words is "three trillion, eight hundred fifty-one billion, six hundred ninety-eight million, twenty-eight thousand, five hundred sixty-one".