61717719072 has 48 divisors (see below), whose sum is σ = 162100122912. Its totient is φ = 20561003520.

The previous prime is 61717719059. The next prime is 61717719083. The reversal of 61717719072 is 27091771716.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8329 + ... + 351432.

It is an arithmetic number, because the mean of its divisors is an integer number (3377085894).

Almost surely, 2^61717719072 is an apocalyptic number.

It is an amenable number.

61717719072 is an abundant number, since it is smaller than the sum of its proper divisors (100382403840).

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

61717719072 is a wasteful number, since it uses less digits than its factorization.

61717719072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361561 (or 361553 counting only the distinct ones).

The product of its (nonzero) digits is 259308, while the sum is 48.

The spelling of 61717719072 in words is "sixty-one billion, seven hundred seventeen million, seven hundred nineteen thousand, seventy-two".