61721472592 has 80 divisors (see below), whose sum is σ = 129939683328. Its totient is φ = 28232432640.

The previous prime is 61721472563. The next prime is 61721472619. The reversal of 61721472592 is 29527412716.

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, 10804617 + ... + 10810327.

Almost surely, 2^61721472592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61721472592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64969841664).

61721472592 is an abundant number, since it is smaller than the sum of its proper divisors (68218210736).

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

61721472592 is a wasteful number, since it uses less digits than its factorization.

61721472592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6188 (or 6182 counting only the distinct ones).

The product of its digits is 423360, while the sum is 46.

The spelling of 61721472592 in words is "sixty-one billion, seven hundred twenty-one million, four hundred seventy-two thousand, five hundred ninety-two".