61435855770 has 64 divisors (see below), whose sum is σ = 150568896384. Its totient is φ = 16037315840.

The previous prime is 61435855751. The next prime is 61435855771. The reversal of 61435855770 is 7755853416.

It is not an unprimeable number, because it can be changed into a prime (61435855771) 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, 660760 + ... + 747980.

It is an arithmetic number, because the mean of its divisors is an integer number (2352639006).

Almost surely, 2^61435855770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61435855770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75284448192).

61435855770 is an abundant number, since it is smaller than the sum of its proper divisors (89133040614).

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

61435855770 is a wasteful number, since it uses less digits than its factorization.

61435855770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87727.

The product of its (nonzero) digits is 3528000, while the sum is 51.

The spelling of 61435855770 in words is "sixty-one billion, four hundred thirty-five million, eight hundred fifty-five thousand, seven hundred seventy".