61505409658 has 192 divisors, whose sum is σ = 130037177088. Its totient is φ = 21459271680.

The previous prime is 61505409613. The next prime is 61505409659. The reversal of 61505409658 is 85690450516.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (61505409659) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 142044610 + ... + 142045042.

It is an arithmetic number, because the mean of its divisors is an integer number (677276964).

Almost surely, 2^61505409658 is an apocalyptic number.

61505409658 is an abundant number, since it is smaller than the sum of its proper divisors (68531767430).

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

61505409658 is a wasteful number, since it uses less digits than its factorization.

61505409658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 61505409658 in words is "sixty-one billion, five hundred five million, four hundred nine thousand, six hundred fifty-eight".