61138203600 has 60 divisors (see below), whose sum is σ = 195846049376. Its totient is φ = 16303520640.

The previous prime is 61138203587. The next prime is 61138203631. The reversal of 61138203600 is 630283116.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25473052 + ... + 25475451.

Almost surely, 2^61138203600 is an apocalyptic number.

61138203600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61138203600 is an abundant number, since it is smaller than the sum of its proper divisors (134707845776).

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

61138203600 is a wasteful number, since it uses less digits than its factorization.

61138203600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50948524 (or 50948513 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 61138203600 its reverse (630283116), we get a palindrome (61768486716).

The spelling of 61138203600 in words is "sixty-one billion, one hundred thirty-eight million, two hundred three thousand, six hundred".