672181057 has 2 divisors, whose sum is σ = 672181058. Its totient is φ = 672181056.

The previous prime is 672180931. The next prime is 672181067. The reversal of 672181057 is 750181276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649179441 + 23001616 = 25479^2 + 4796^2 .

It is a cyclic number.

It is not a de Polignac number, because 672181057 - 2²³ = 663792449 is a prime.

It is not a weakly prime, because it can be changed into another prime (672181067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336090528 + 336090529.

It is an arithmetic number, because the mean of its divisors is an integer number (336090529).

Almost surely, 2^672181057 is an apocalyptic number.

It is an amenable number.

672181057 is a deficient number, since it is larger than the sum of its proper divisors (1).

672181057 is an equidigital number, since it uses as much as digits as its factorization.

672181057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 672181057 is about 25926.4547711406. The cubic root of 672181057 is about 875.9824858539.

It can be divided in two parts, 6721 and 81057, that added together give a palindrome (87778).

The spelling of 672181057 in words is "six hundred seventy-two million, one hundred eighty-one thousand, fifty-seven".