672221617157 has 2 divisors, whose sum is σ = 672221617158. Its totient is φ = 672221617156.

The previous prime is 672221617121. The next prime is 672221617189. The reversal of 672221617157 is 751716122276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661113721921 + 11107895236 = 813089^2 + 105394^2 .

It is a cyclic number.

It is not a de Polignac number, because 672221617157 - 2¹⁰ = 672221616133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (672221617117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336110808578 + 336110808579.

It is an arithmetic number, because the mean of its divisors is an integer number (336110808579).

Almost surely, 2^672221617157 is an apocalyptic number.

It is an amenable number.

672221617157 is a deficient number, since it is larger than the sum of its proper divisors (1).

672221617157 is an equidigital number, since it uses as much as digits as its factorization.

672221617157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The spelling of 672221617157 in words is "six hundred seventy-two billion, two hundred twenty-one million, six hundred seventeen thousand, one hundred fifty-seven".