611664661057 has 2 divisors, whose sum is σ = 611664661058. Its totient is φ = 611664661056.

The previous prime is 611664661039. The next prime is 611664661061. The reversal of 611664661057 is 750166466116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507583577601 + 104081083456 = 712449^2 + 322616^2 .

It is a cyclic number.

It is not a de Polignac number, because 611664661057 - 2²³ = 611656272449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 611664661057.

It is not a weakly prime, because it can be changed into another prime (611664664057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305832330528 + 305832330529.

It is an arithmetic number, because the mean of its divisors is an integer number (305832330529).

Almost surely, 2^611664661057 is an apocalyptic number.

It is an amenable number.

611664661057 is a deficient number, since it is larger than the sum of its proper divisors (1).

611664661057 is an equidigital number, since it uses as much as digits as its factorization.

611664661057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

It can be divided in two parts, 611664 and 661057, that added together give a palindrome (1272721).

The spelling of 611664661057 in words is "six hundred eleven billion, six hundred sixty-four million, six hundred sixty-one thousand, fifty-seven".