61512006665 has 8 divisors (see below), whose sum is σ = 77699376960. Its totient is φ = 46619626032.

The previous prime is 61512006659. The next prime is 61512006667. The reversal of 61512006665 is 56660021516.

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

It is a de Polignac number, because none of the positive numbers 2^k-61512006665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61512006667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323747309 + ... + 323747498.

It is an arithmetic number, because the mean of its divisors is an integer number (9712422120).

Almost surely, 2^61512006665 is an apocalyptic number.

It is an amenable number.

61512006665 is a deficient number, since it is larger than the sum of its proper divisors (16187370295).

61512006665 is a wasteful number, since it uses less digits than its factorization.

61512006665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647494831.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 61512006665 in words is "sixty-one billion, five hundred twelve million, six thousand, six hundred sixty-five".