61555650500 has 24 divisors (see below), whose sum is σ = 134437541784. Its totient is φ = 24622260000.

The previous prime is 61555650491. The next prime is 61555650509. The reversal of 61555650500 is 505655516.

It is an interprime number because it is at equal distance from previous prime (61555650491) and next prime (61555650509).

It can be written as a sum of positive squares in 4 ways, for example, as 1342343044 + 60213307456 = 36638^2 + 245384^2 .

It is not an unprimeable number, because it can be changed into a prime (61555650509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61555151 + ... + 61556150.

It is an arithmetic number, because the mean of its divisors is an integer number (5601564241).

Almost surely, 2^61555650500 is an apocalyptic number.

It is an amenable number.

61555650500 is an abundant number, since it is smaller than the sum of its proper divisors (72881891284).

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

61555650500 is a wasteful number, since it uses less digits than its factorization.

61555650500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123111320 (or 123111308 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The spelling of 61555650500 in words is "sixty-one billion, five hundred fifty-five million, six hundred fifty thousand, five hundred".