61515660105 has 48 divisors (see below), whose sum is σ = 106969838976. Its totient is φ = 32703091200.

The previous prime is 61515660103. The next prime is 61515660119. The reversal of 61515660105 is 50106651516.

It is not a de Polignac number, because 61515660105 - 2¹ = 61515660103 is a prime.

It is a super-3 number, since 3×61515660105³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 61515660105.

It is not an unprimeable number, because it can be changed into a prime (61515660103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32842449 + ... + 32844321.

It is an arithmetic number, because the mean of its divisors is an integer number (2228538312).

Almost surely, 2^61515660105 is an apocalyptic number.

It is an amenable number.

61515660105 is a deficient number, since it is larger than the sum of its proper divisors (45454178871).

61515660105 is a wasteful number, since it uses less digits than its factorization.

61515660105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838 (or 3835 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 61515660105 in words is "sixty-one billion, five hundred fifteen million, six hundred sixty thousand, one hundred five".