720165672981 has 16 divisors (see below), whose sum is σ = 1066936907520. Its totient is φ = 480099288960.

The previous prime is 720165672953. The next prime is 720165673021. The reversal of 720165672981 is 189276561027.

720165672981 is a `hidden beast` number, since 72 + 0 + 1 + 6 + 567 + 2 + 9 + 8 + 1 = 666.

It is not a de Polignac number, because 720165672981 - 2⁹ = 720165672469 is a prime.

It is a super-2 number, since 2×720165672981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720165672581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969061 + ... + 1542533.

It is an arithmetic number, because the mean of its divisors is an integer number (66683556720).

Almost surely, 2^720165672981 is an apocalyptic number.

It is an amenable number.

720165672981 is a deficient number, since it is larger than the sum of its proper divisors (346771234539).

720165672981 is a wasteful number, since it uses less digits than its factorization.

720165672981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619993 (or 619987 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 720165672981 in words is "seven hundred twenty billion, one hundred sixty-five million, six hundred seventy-two thousand, nine hundred eighty-one".