61505739212 has 12 divisors (see below), whose sum is σ = 110544099120. Its totient is φ = 29921710896.

The previous prime is 61505739187. The next prime is 61505739259. The reversal of 61505739212 is 21293750516.

It is a super-3 number, since 3×61505739212³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61505739212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207789512 + ... + 207789807.

It is an arithmetic number, because the mean of its divisors is an integer number (9212008260).

Almost surely, 2^61505739212 is an apocalyptic number.

It is an amenable number.

61505739212 is a deficient number, since it is larger than the sum of its proper divisors (49038359908).

61505739212 is a wasteful number, since it uses less digits than its factorization.

61505739212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415579360 (or 415579358 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 41.

The spelling of 61505739212 in words is "sixty-one billion, five hundred five million, seven hundred thirty-nine thousand, two hundred twelve".