672537090721 has 4 divisors (see below), whose sum is σ = 672575944852. Its totient is φ = 672498236592.

The previous prime is 672537090703. The next prime is 672537090781. The reversal of 672537090721 is 127090735276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 592130250000 + 80406840721 = 769500^2 + 283561^2 .

It is a cyclic number.

It is not a de Polignac number, because 672537090721 - 2⁹ = 672537090209 is a prime.

It is a super-2 number, since 2×672537090721² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672537090781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19401090 + ... + 19435723.

It is an arithmetic number, because the mean of its divisors is an integer number (168143986213).

Almost surely, 2^672537090721 is an apocalyptic number.

It is an amenable number.

672537090721 is a deficient number, since it is larger than the sum of its proper divisors (38854131).

672537090721 is a wasteful number, since it uses less digits than its factorization.

672537090721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38854130.

The product of its (nonzero) digits is 1111320, while the sum is 49.

The spelling of 672537090721 in words is "six hundred seventy-two billion, five hundred thirty-seven million, ninety thousand, seven hundred twenty-one".