672027771529 has 3 divisors (see below), whose sum is σ = 672028591303. Its totient is φ = 672026951756.

The previous prime is 672027771523. The next prime is 672027771539. The reversal of 672027771529 is 925177720276.

The square root of 672027771529 is 819773.

It is a perfect power (a square), and thus also a powerful number.

672027771529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 443975679225 + 228052092304 = 666315^2 + 477548^2 .

It is not a de Polignac number, because 672027771529 - 2³ = 672027771521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 672027771529.

It is not an unprimeable number, because it can be changed into a prime (672027771521) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 409887 + ... + 1229659.

Almost surely, 2^672027771529 is an apocalyptic number.

672027771529 is the 819773-rd square number.

672027771529 is the 409887-th centered octagonal number.

It is an amenable number.

672027771529 is a deficient number, since it is larger than the sum of its proper divisors (819774).

672027771529 is an frugal number, since it uses more digits than its factorization.

672027771529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639546 (or 819773 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 672027771529 in words is "six hundred seventy-two billion, twenty-seven million, seven hundred seventy-one thousand, five hundred twenty-nine".