63772507681 has 8 divisors (see below), whose sum is σ = 65976016680. Its totient is φ = 61569295872.

The previous prime is 63772507679. The next prime is 63772507723. The reversal of 63772507681 is 18670527736.

63772507681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20817872656 + 42954635025 = 144284^2 + 207255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63772507681 - 2¹ = 63772507679 is a prime.

It is a super-2 number, since 2×63772507681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63772507481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417571 + ... + 549463.

It is an arithmetic number, because the mean of its divisors is an integer number (8247002085).

Almost surely, 2^63772507681 is an apocalyptic number.

It is an amenable number.

63772507681 is a deficient number, since it is larger than the sum of its proper divisors (2203508999).

63772507681 is a wasteful number, since it uses less digits than its factorization.

63772507681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148595.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 63772507681 in words is "sixty-three billion, seven hundred seventy-two million, five hundred seven thousand, six hundred eighty-one".