61997095660 has 96 divisors (see below), whose sum is σ = 141713385408. Its totient is φ = 22687580160.

The previous prime is 61997095649. The next prime is 61997095673. The reversal of 61997095660 is 6659079916.

It is a junction number, because it is equal to n+sod(n) for n = 61997095595 and 61997095604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19761612 + ... + 19764748.

It is an arithmetic number, because the mean of its divisors is an integer number (1476181098).

Almost surely, 2^61997095660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61997095660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70856692704).

61997095660 is an abundant number, since it is smaller than the sum of its proper divisors (79716289748).

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

61997095660 is a wasteful number, since it uses less digits than its factorization.

61997095660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4771 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 61997095660 in words is "sixty-one billion, nine hundred ninety-seven million, ninety-five thousand, six hundred sixty".