654777649 has 2 divisors, whose sum is σ = 654777650. Its totient is φ = 654777648.

The previous prime is 654777589. The next prime is 654777659. The reversal of 654777649 is 946777456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578739249 + 76038400 = 24057^2 + 8720^2 .

It is a cyclic number.

It is not a de Polignac number, because 654777649 - 2¹³ = 654769457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654777649.

It is not a weakly prime, because it can be changed into another prime (654777659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327388824 + 327388825.

It is an arithmetic number, because the mean of its divisors is an integer number (327388825).

Almost surely, 2^654777649 is an apocalyptic number.

It is an amenable number.

654777649 is a deficient number, since it is larger than the sum of its proper divisors (1).

654777649 is an equidigital number, since it uses as much as digits as its factorization.

654777649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8890560, while the sum is 55.

The square root of 654777649 is about 25588.6234291726. The cubic root of 654777649 is about 868.3562785442.

The spelling of 654777649 in words is "six hundred fifty-four million, seven hundred seventy-seven thousand, six hundred forty-nine".