61512017424 has 160 divisors (see below), whose sum is σ = 187071360000. Its totient is φ = 17170721280.

The previous prime is 61512017341. The next prime is 61512017429. The reversal of 61512017424 is 42471021516.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61512017429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3416157 + ... + 3434115.

It is an arithmetic number, because the mean of its divisors is an integer number (1169196000).

Almost surely, 2^61512017424 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 61512017424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93535680000).

61512017424 is an abundant number, since it is smaller than the sum of its proper divisors (125559342576).

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

61512017424 is a wasteful number, since it uses less digits than its factorization.

61512017424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18493 (or 18487 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 61512017424 in words is "sixty-one billion, five hundred twelve million, seventeen thousand, four hundred twenty-four".