63701617561 has 4 divisors (see below), whose sum is σ = 63721734912. Its totient is φ = 63681500212.

The previous prime is 63701617513. The next prime is 63701617583. The reversal of 63701617561 is 16571610736.

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 63701617561 - 2²³ = 63693228953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63701612561) 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, 10053925 + ... + 10060258.

It is an arithmetic number, because the mean of its divisors is an integer number (15930433728).

Almost surely, 2^63701617561 is an apocalyptic number.

It is an amenable number.

63701617561 is a deficient number, since it is larger than the sum of its proper divisors (20117351).

63701617561 is a wasteful number, since it uses less digits than its factorization.

63701617561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20117350.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 63701617561 in words is "sixty-three billion, seven hundred one million, six hundred seventeen thousand, five hundred sixty-one".