63620802561 has 4 divisors (see below), whose sum is σ = 84827736752. Its totient is φ = 42413868372.

The previous prime is 63620802551. The next prime is 63620802593. The reversal of 63620802561 is 16520802636.

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 not a de Polignac number, because 63620802561 - 2¹⁷ = 63620671489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63620802551) 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, 10603467091 + ... + 10603467096.

It is an arithmetic number, because the mean of its divisors is an integer number (21206934188).

Almost surely, 2^63620802561 is an apocalyptic number.

It is an amenable number.

63620802561 is a deficient number, since it is larger than the sum of its proper divisors (21206934191).

63620802561 is a wasteful number, since it uses less digits than its factorization.

63620802561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21206934190.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 63620802561 in words is "sixty-three billion, six hundred twenty million, eight hundred two thousand, five hundred sixty-one".