61121250016 has 96 divisors (see below), whose sum is σ = 130707343872. Its totient is φ = 28024289280.

The previous prime is 61121250013. The next prime is 61121250023. The reversal of 61121250016 is 61005212116.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121250013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5798671 + ... + 5809201.

It is an arithmetic number, because the mean of its divisors is an integer number (1361534832).

Almost surely, 2^61121250016 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 61121250016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65353671936).

61121250016 is an abundant number, since it is smaller than the sum of its proper divisors (69586093856).

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

61121250016 is a wasteful number, since it uses less digits than its factorization.

61121250016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10832 (or 10824 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 61121250016 in words is "sixty-one billion, one hundred twenty-one million, two hundred fifty thousand, sixteen".