61159943904 has 96 divisors (see below), whose sum is σ = 169106071680. Its totient is φ = 19300925952.

The previous prime is 61159943863. The next prime is 61159943917. The reversal of 61159943904 is 40934995116.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×61159943904² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2975647 + ... + 2996129.

It is an arithmetic number, because the mean of its divisors is an integer number (1761521580).

Almost surely, 2^61159943904 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 61159943904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84553035840).

61159943904 is an abundant number, since it is smaller than the sum of its proper divisors (107946127776).

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

61159943904 is a wasteful number, since it uses less digits than its factorization.

61159943904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22152 (or 22144 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The spelling of 61159943904 in words is "sixty-one billion, one hundred fifty-nine million, nine hundred forty-three thousand, nine hundred four".