672770643381 has 12 divisors (see below), whose sum is σ = 971854527852. Its totient is φ = 448479280896.

The previous prime is 672770643373. The next prime is 672770643497. The reversal of 672770643381 is 183346077276.

672770643381 is a `hidden beast` number, since 67 + 2 + 7 + 70 + 6 + 433 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 341512840881 + 331257802500 = 584391^2 + 575550^2 .

It is not a de Polignac number, because 672770643381 - 2³ = 672770643373 is a prime.

It is a super-2 number, since 2×672770643381² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672770643301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2749596 + ... + 2984261.

It is an arithmetic number, because the mean of its divisors is an integer number (80987877321).

Almost surely, 2^672770643381 is an apocalyptic number.

It is an amenable number.

672770643381 is a deficient number, since it is larger than the sum of its proper divisors (299083884471).

672770643381 is a wasteful number, since it uses less digits than its factorization.

672770643381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5746900 (or 5746897 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 54.

The spelling of 672770643381 in words is "six hundred seventy-two billion, seven hundred seventy million, six hundred forty-three thousand, three hundred eighty-one".