63171408001720 has 64 divisors (see below), whose sum is σ = 142261545709440. Its totient is φ = 25246189900800.

The previous prime is 63171408001717. The next prime is 63171408001781. The reversal of 63171408001720 is 2710080417136.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434324929 + ... + 434470351.

It is an arithmetic number, because the mean of its divisors is an integer number (2222836651710).

Almost surely, 2^{63171408001720} is an apocalyptic number.

It is an amenable number.

63171408001720 is an abundant number, since it is smaller than the sum of its proper divisors (79090137707720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63171408001720 is a wasteful number, since it uses less digits than its factorization.

63171408001720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154976 (or 154972 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

Adding to 63171408001720 its reverse (2710080417136), we get a palindrome (65881488418856).

The spelling of 63171408001720 in words is "sixty-three trillion, one hundred seventy-one billion, four hundred eight million, one thousand, seven hundred twenty".