642041677 has 2 divisors, whose sum is σ = 642041678. Its totient is φ = 642041676.

The previous prime is 642041663. The next prime is 642041783. The reversal of 642041677 is 776140246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601769961 + 40271716 = 24531^2 + 6346^2 .

It is a cyclic number.

It is not a de Polignac number, because 642041677 - 2⁷ = 642041549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642041657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321020838 + 321020839.

It is an arithmetic number, because the mean of its divisors is an integer number (321020839).

Almost surely, 2^642041677 is an apocalyptic number.

It is an amenable number.

642041677 is a deficient number, since it is larger than the sum of its proper divisors (1).

642041677 is an equidigital number, since it uses as much as digits as its factorization.

642041677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 642041677 is about 25338.5413352861. The cubic root of 642041677 is about 862.6892907229.

The spelling of 642041677 in words is "six hundred forty-two million, forty-one thousand, six hundred seventy-seven".