7700420251 has 2 divisors, whose sum is σ = 7700420252. Its totient is φ = 7700420250.

The previous prime is 7700420219. The next prime is 7700420269. The reversal of 7700420251 is 1520240077.

It is a strong prime.

It is an emirp because it is prime and its reverse (1520240077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7700420251 - 2⁵ = 7700420219 is a prime.

It is not a weakly prime, because it can be changed into another prime (7700420281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3850210125 + 3850210126.

It is an arithmetic number, because the mean of its divisors is an integer number (3850210126).

Almost surely, 2^7700420251 is an apocalyptic number.

7700420251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7700420251 is an equidigital number, since it uses as much as digits as its factorization.

7700420251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 7700420251 is about 87752.0384435598. The cubic root of 7700420251 is about 1974.7167463030.

The spelling of 7700420251 in words is "seven billion, seven hundred million, four hundred twenty thousand, two hundred fifty-one".