61187891733505 has 8 divisors (see below), whose sum is σ = 77289968505600. Its totient is φ = 46373981103216.

The previous prime is 61187891733503. The next prime is 61187891733509. The reversal of 61187891733505 is 50533719878116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61187891733505 - 2¹ = 61187891733503 is a prime.

It is a super-2 number, since 2×61187891733505² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61187891733503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322041535345 + ... + 322041535534.

It is an arithmetic number, because the mean of its divisors is an integer number (9661246063200).

Almost surely, 2^{61187891733505} is an apocalyptic number.

It is an amenable number.

61187891733505 is a deficient number, since it is larger than the sum of its proper divisors (16102076772095).

61187891733505 is a wasteful number, since it uses less digits than its factorization.

61187891733505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644083070903.

The product of its (nonzero) digits is 38102400, while the sum is 64.

The spelling of 61187891733505 in words is "sixty-one trillion, one hundred eighty-seven billion, eight hundred ninety-one million, seven hundred thirty-three thousand, five hundred five".