61310553640 has 32 divisors (see below), whose sum is σ = 157655710080. Its totient is φ = 21020761152.

The previous prime is 61310553613. The next prime is 61310553641. The reversal of 61310553640 is 4635501316.

It is a junction number, because it is equal to n+sod(n) for n = 61310553596 and 61310553605.

It is not an unprimeable number, because it can be changed into a prime (61310553641) 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, 109482852 + ... + 109483411.

It is an arithmetic number, because the mean of its divisors is an integer number (4926740940).

Almost surely, 2^61310553640 is an apocalyptic number.

It is an amenable number.

61310553640 is an abundant number, since it is smaller than the sum of its proper divisors (96345156440).

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

61310553640 is a wasteful number, since it uses less digits than its factorization.

61310553640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218966281 (or 218966277 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 61310553640 in words is "sixty-one billion, three hundred ten million, five hundred fifty-three thousand, six hundred forty".