572721656765 has 4 divisors (see below), whose sum is σ = 687265988124. Its totient is φ = 458177325408.

The previous prime is 572721656761. The next prime is 572721656807. The reversal of 572721656765 is 567656127275.

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 186407199001 + 386314457764 = 431749^2 + 621542^2 .

It is a cyclic number.

It is not a de Polignac number, because 572721656765 - 2² = 572721656761 is a prime.

It is a super-2 number, since 2×572721656765² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (572721656761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57272165672 + ... + 57272165681.

It is an arithmetic number, because the mean of its divisors is an integer number (171816497031).

Almost surely, 2^572721656765 is an apocalyptic number.

It is an amenable number.

572721656765 is a deficient number, since it is larger than the sum of its proper divisors (114544331359).

572721656765 is a wasteful number, since it uses less digits than its factorization.

572721656765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114544331358.

The product of its digits is 37044000, while the sum is 59.

The spelling of 572721656765 in words is "five hundred seventy-two billion, seven hundred twenty-one million, six hundred fifty-six thousand, seven hundred sixty-five".