61661402320200 has 96 divisors (see below), whose sum is σ = 197316487484160. Its totient is φ = 15912619948800.

The previous prime is 61661402320139. The next prime is 61661402320261. The reversal of 61661402320200 is 202320416616.

It is an interprime number because it is at equal distance from previous prime (61661402320139) and next prime (61661402320261).

It is a super-3 number, since 3×61661402320200³ (a number of 42 digits) contains 333 as substring.

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, 1657545979 + ... + 1657583178.

It is an arithmetic number, because the mean of its divisors is an integer number (2055380077960).

Almost surely, 2^{61661402320200} is an apocalyptic number.

61661402320200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61661402320200 is an abundant number, since it is smaller than the sum of its proper divisors (135655085163960).

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

61661402320200 is a wasteful number, since it uses less digits than its factorization.

61661402320200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315129207 (or 3315129198 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

Adding to 61661402320200 its reverse (202320416616), we get a palindrome (61863722736816).

The spelling of 61661402320200 in words is "sixty-one trillion, six hundred sixty-one billion, four hundred two million, three hundred twenty thousand, two hundred".