61217643552 has 192 divisors, whose sum is σ = 184019351040. Its totient is φ = 17652547584.

The previous prime is 61217643551. The next prime is 61217643581. The reversal of 61217643552 is 25534671216.

It is not an unprimeable number, because it can be changed into a prime (61217643551) 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, 5064588 + ... + 5076660.

It is an arithmetic number, because the mean of its divisors is an integer number (958434120).

Almost surely, 2^61217643552 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 61217643552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92009675520).

61217643552 is an abundant number, since it is smaller than the sum of its proper divisors (122801707488).

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

61217643552 is a wasteful number, since it uses less digits than its factorization.

61217643552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12355 (or 12347 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The spelling of 61217643552 in words is "sixty-one billion, two hundred seventeen million, six hundred forty-three thousand, five hundred fifty-two".