61509236196 has 12 divisors (see below), whose sum is σ = 143521551152. Its totient is φ = 20503078728.

The previous prime is 61509236177. The next prime is 61509236207. The reversal of 61509236196 is 69163290516.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×61509236196² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2562884830 + ... + 2562884853.

Almost surely, 2^61509236196 is an apocalyptic number.

It is an amenable number.

61509236196 is an abundant number, since it is smaller than the sum of its proper divisors (82012314956).

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

61509236196 is a wasteful number, since it uses less digits than its factorization.

61509236196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125769690 (or 5125769688 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The spelling of 61509236196 in words is "sixty-one billion, five hundred nine million, two hundred thirty-six thousand, one hundred ninety-six".