772872650644 has 6 divisors (see below), whose sum is σ = 1352527138634. Its totient is φ = 386436325320.

The previous prime is 772872650621. The next prime is 772872650647. The reversal of 772872650644 is 446056278277.

It can be written as a sum of positive squares in only one way, i.e., 529419222544 + 243453428100 = 727612^2 + 493410^2 .

It is a super-2 number, since 2×772872650644² (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 (772872650647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96609081327 + ... + 96609081334.

Almost surely, 2^772872650644 is an apocalyptic number.

It is an amenable number.

772872650644 is a deficient number, since it is larger than the sum of its proper divisors (579654487990).

772872650644 is a wasteful number, since it uses less digits than its factorization.

772872650644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193218162665 (or 193218162663 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 58.

The spelling of 772872650644 in words is "seven hundred seventy-two billion, eight hundred seventy-two million, six hundred fifty thousand, six hundred forty-four".