672056557 has 2 divisors, whose sum is σ = 672056558. Its totient is φ = 672056556.

The previous prime is 672056537. The next prime is 672056587. The reversal of 672056557 is 755650276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 589809796 + 82246761 = 24286^2 + 9069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672056557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672056507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336028278 + 336028279.

It is an arithmetic number, because the mean of its divisors is an integer number (336028279).

Almost surely, 2^672056557 is an apocalyptic number.

It is an amenable number.

672056557 is a deficient number, since it is larger than the sum of its proper divisors (1).

672056557 is an equidigital number, since it uses as much as digits as its factorization.

672056557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 441000, while the sum is 43.

The square root of 672056557 is about 25924.0536375004. The cubic root of 672056557 is about 875.9283999533.

The spelling of 672056557 in words is "six hundred seventy-two million, fifty-six thousand, five hundred fifty-seven".