61029911540 has 48 divisors (see below), whose sum is σ = 138094104960. Its totient is φ = 22522266240.

The previous prime is 61029911521. The next prime is 61029911597. The reversal of 61029911540 is 4511992016.

It is a junction number, because it is equal to n+sod(n) for n = 61029911494 and 61029911503.

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, 441281 + ... + 562839.

It is an arithmetic number, because the mean of its divisors is an integer number (2876960520).

Almost surely, 2^61029911540 is an apocalyptic number.

It is an amenable number.

61029911540 is an abundant number, since it is smaller than the sum of its proper divisors (77064193420).

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

61029911540 is a wasteful number, since it uses less digits than its factorization.

61029911540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123512 (or 123510 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The spelling of 61029911540 in words is "sixty-one billion, twenty-nine million, nine hundred eleven thousand, five hundred forty".