61001398872 has 96 divisors (see below), whose sum is σ = 172067669280. Its totient is φ = 19505525760.

The previous prime is 61001398853. The next prime is 61001398901. The reversal of 61001398872 is 27889310016.

It is a super-4 number, since 4×61001398872⁴ (a number of 44 digits) contains 4444 as substring.

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, 27888 + ... + 350400.

It is an arithmetic number, because the mean of its divisors is an integer number (1792371555).

Almost surely, 2^61001398872 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 61001398872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86033834640).

61001398872 is an abundant number, since it is smaller than the sum of its proper divisors (111066270408).

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

61001398872 is a wasteful number, since it uses less digits than its factorization.

61001398872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322633 (or 322626 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 61001398872 in words is "sixty-one billion, one million, three hundred ninety-eight thousand, eight hundred seventy-two".