63513547781 has 4 divisors (see below), whose sum is σ = 64408104864. Its totient is φ = 62618990700.

The previous prime is 63513547763. The next prime is 63513547789. The reversal of 63513547781 is 18774531536.

63513547781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63513547781 - 2⁶ = 63513547717 is a prime.

It is a super-2 number, since 2×63513547781² (a number of 22 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 (63513547789) 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, 447278435 + ... + 447278576.

It is an arithmetic number, because the mean of its divisors is an integer number (16102026216).

Almost surely, 2^63513547781 is an apocalyptic number.

It is an amenable number.

63513547781 is a deficient number, since it is larger than the sum of its proper divisors (894557083).

63513547781 is an equidigital number, since it uses as much as digits as its factorization.

63513547781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894557082.

The product of its digits is 2116800, while the sum is 50.

The spelling of 63513547781 in words is "sixty-three billion, five hundred thirteen million, five hundred forty-seven thousand, seven hundred eighty-one".