1625216977 has 2 divisors, whose sum is σ = 1625216978. Its totient is φ = 1625216976.

The previous prime is 1625216953. The next prime is 1625217023. The reversal of 1625216977 is 7796125261.

It is an a-pointer prime, because the next prime (1625217023) can be obtained adding 1625216977 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1439140096 + 186076881 = 37936^2 + 13641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625216977 - 2⁷ = 1625216849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625216947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812608488 + 812608489.

It is an arithmetic number, because the mean of its divisors is an integer number (812608489).

Almost surely, 2^1625216977 is an apocalyptic number.

It is an amenable number.

1625216977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625216977 is an equidigital number, since it uses as much as digits as its factorization.

1625216977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 1625216977 is about 40313.9799201220. The cubic root of 1625216977 is about 1175.7196682543.

The spelling of 1625216977 in words is "one billion, six hundred twenty-five million, two hundred sixteen thousand, nine hundred seventy-seven".