61530033816 has 96 divisors (see below), whose sum is σ = 173144322000. Its totient is φ = 19716141312.

The previous prime is 61530033793. The next prime is 61530033821. The reversal of 61530033816 is 61833003516.

It is a happy number.

61530033816 is a `hidden beast` number, since 6 + 1 + 5 + 300 + 338 + 16 = 666.

It is a super-2 number, since 2×61530033816² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 413811 + ... + 542493.

Almost surely, 2^61530033816 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 61530033816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86572161000).

61530033816 is an abundant number, since it is smaller than the sum of its proper divisors (111614288184).

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

61530033816 is a wasteful number, since it uses less digits than its factorization.

61530033816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128953 (or 128946 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 61530033816 in words is "sixty-one billion, five hundred thirty million, thirty-three thousand, eight hundred sixteen".