61500665159978 has 16 divisors (see below), whose sum is σ = 100638785651040. Its totient is φ = 27954477363600.

The previous prime is 61500665159963. The next prime is 61500665159993. The reversal of 61500665159978 is 87995156600516.

It is an interprime number because it is at equal distance from previous prime (61500665159963) and next prime (61500665159993).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16820393 + ... + 20147628.

It is an arithmetic number, because the mean of its divisors is an integer number (6289924103190).

Almost surely, 2^{61500665159978} is an apocalyptic number.

61500665159978 is a deficient number, since it is larger than the sum of its proper divisors (39138120491062).

61500665159978 is a wasteful number, since it uses less digits than its factorization.

61500665159978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37043653.

The product of its (nonzero) digits is 122472000, while the sum is 68.

The spelling of 61500665159978 in words is "sixty-one trillion, five hundred billion, six hundred sixty-five million, one hundred fifty-nine thousand, nine hundred seventy-eight".