61573732704 has 216 divisors, whose sum is σ = 192970716120. Its totient is φ = 18609761280.

The previous prime is 61573732697. The next prime is 61573732711. The reversal of 61573732704 is 40723737516.

61573732704 is a `hidden beast` number, since 6 + 1 + 5 + 7 + 373 + 270 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (61573732697) and next prime (61573732711).

It is a self number, because there is not a number n which added to its sum of digits gives 61573732704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14599204 + ... + 14603420.

It is an arithmetic number, because the mean of its divisors is an integer number (893382945).

Almost surely, 2^61573732704 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 61573732704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96485358060).

61573732704 is an abundant number, since it is smaller than the sum of its proper divisors (131396983416).

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

61573732704 is a wasteful number, since it uses less digits than its factorization.

61573732704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674 (or 4652 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The spelling of 61573732704 in words is "sixty-one billion, five hundred seventy-three million, seven hundred thirty-two thousand, seven hundred four".