661610463400 has 96 divisors (see below), whose sum is σ = 1542256646400. Its totient is φ = 263954764800.

The previous prime is 661610463379. The next prime is 661610463433. The reversal of 661610463400 is 4364016166.

It is a self number, because there is not a number n which added to its sum of digits gives 661610463400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243327241 + ... + 243329959.

It is an arithmetic number, because the mean of its divisors is an integer number (16065173400).

Almost surely, 2^661610463400 is an apocalyptic number.

It is an amenable number.

661610463400 is an abundant number, since it is smaller than the sum of its proper divisors (880646183000).

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

661610463400 is a wasteful number, since it uses less digits than its factorization.

661610463400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459 (or 5450 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 661610463400 its reverse (4364016166), we get a palindrome (665974479566).

The spelling of 661610463400 in words is "six hundred sixty-one billion, six hundred ten million, four hundred sixty-three thousand, four hundred".