61008357840 has 80 divisors (see below), whose sum is σ = 189974174208. Its totient is φ = 16195926528.

The previous prime is 61008357829. The next prime is 61008357881. The reversal of 61008357840 is 4875380016.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 61008357792 and 61008357801.

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, 516439 + ... + 623478.

Almost surely, 2^61008357840 is an apocalyptic number.

61008357840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61008357840 is an abundant number, since it is smaller than the sum of its proper divisors (128965816368).

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

61008357840 is a wasteful number, since it uses less digits than its factorization.

61008357840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1140156 (or 1140150 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 61008357840 in words is "sixty-one billion, eight million, three hundred fifty-seven thousand, eight hundred forty".